Jeremiah Hackett

The paper presents evidence that Roger Bacon was endeavoring to structure what he considered as a “new metaphysics”. Moreover, it identifies the Opus maius as Bacon’s new preliminary text in metaphysics and morals. The evidence is found in the Communia naturalium and in the Communia mathematica, in which one finds a reference to the Opus maius as a sketch for a new metaphysics. From part seven of the latter work, namely, the Moralis philosophia, one can see that Bacon views the latter work as closely connected to his new metaphysics. In fact, the material in the Communia mathematica connects his studies on languages to the communication of his moral vision. I present a review of the sources for the different parts of the Opus maius. This is followed by an account of Bacon’s philosophical sources. It becomes clear that Bacon was acquainted with Plato’s Meno, Phaedo and part of the Timaeus with Calcidius’s Commentary. The variety and significance of his Neo-Platonic sources are outlined. It turns out that Bacon was not an Avicennian substance-dualist. Moreover, the paper demonstrates the extent to which Bacon’s criticism of Averroes was based on his natural philosophy. Bacon presents an account of human intellectual knowledge which is clearly based on and refers to his account of human perceptual knowledge in his Perspectiva. He uses his account of an integrated perceptual and intellectual human individual being to question the Latin Averroist’s claim that there is one possible intellect for all human beings.

The paper examines Roger Bacon’s use of the concept virtus in the Communia naturalium and De multiplication specierum. It focuses on the roles which virtus and species play as vehicles of causality in the inanimate realm. It analyses the distinct functions played by virtus in the motion of celestial spheres, the power of natural place, the attraction of iron to magnet, and the universal nature. The analysis concludes that virtus is an efficient power, a feature of form, capable of causing local motion and instigating natural processes. Species is matter’s response to the stimulation made by virtus through which every natural action, to the exclusion of local motion, is made. Species is a non-efficient power, an ‘appetite’ internal to matter. It is an expression of matter’s inherent inclination to promote and perfect itself, the result of matter’s ‘active potentiality’.

The photosynthetic organelle of algae and plants (the plastid) traces its origin to a primary endosymbiotic event in which a previously non‐photosynthetic protist engulfed and enslaved a cyanobacterium. This eukaryote then gave rise to the red, green and glaucophyte algae. However, many algal lineages, such as the chlorophyll c‐containing chromists, have a more complicated evolutionary history involving a secondary endosymbiotic event, in which a protist engulfed an existing eukaryotic alga (in this case, a red alga). Chromists such as diatoms and kelps then rose to great importance in aquatic habitats. Another algal group, the dinoflagellates, has undergone tertiary (engulfment of a secondary plastid) and even quaternary endosymbioses. In this review, we examine algal diversity and show endosymbiosis to be a major force in algal evolution. This area of research has advanced rapidly and long‐standing issues such as the chromalveolate hypothesis and the extent of endosymbiotic gene transfer have recently been clarified. BioEssays 26:50–60, 2004. © 2003 Wiley Periodicals, Inc.

Marjorie Grene's essays dealing with twentieth-century European philosophy are, as she informs the reader, "written from something like 'a continental' point of view." She also informs the reader that these collected essays, written at various times between 1938 and 1974, are a form of philosophical journalism. If it is journalism, then, it is journalism of a high quality. The book may also serve as a kind of record of the itinerarium mentis of a very lively and perceptive reader of philosophy in both continental and in modern American forms.

Ce volume dégage les racines médiévales des thèmes principaux de la philosophie contemporaine. Il montre les conséquences de la distinctio formalis sur les notions médiévales et modernes de la causalité, par là sur celles de l'esse objectivum et du signifié propositionnel dans le connaître humain. This book examines the medieval origin of certain themes in modern and contemporary philosophy. It shows the consequences of the distinctio formalis on medieval and modern conceptions of causality, including those of the esse objectivum and on the complexe significatum .

In lieu of an abstract, here is a brief excerpt of the content:Reviewed by:Roger Bacon and the Origins of “Perspectiva” in the Middle Ages: A Critical Edition and English Translation of Bacon’s “Perspectiva” with Introduction and Notes by David C. LindbergJeremiah HackettDavid C. Lindberg. Roger Bacon and the Origins of “Perspectiva” in the Middle Ages: A Critical Edition and English Translation of Bacon’s “Perspectiva” with Introduction and Notes. Oxford: Clarendon Press, 1996. Pp. cxi + 411. NP.This new critical edition of the Perspectiva (= Opus maius, Part Five) of Roger Bacon is a landmark in Roger Bacon studies and in medieval philosophy. One needs to be able to depend on critical texts. In the case of Bacon’s Perspectiva, no such printed text existed. Professor David C. Lindberg in this new critical edition of the Perspectiva has rectified this absurd situation. And he has done a magnificent service to scholarship. He has produced the first adequate text and translation of this major philosophical text by Roger Bacon. To appreciate his achievement, a review of the previous editions is in order.Prior to Lindberg’s critical edition, there have been three Latin editions: Combach (1614), Jebb (1733, 1750), Bridges (1879 Bridges (1900). Combach used a single Oxford manuscript which is no longer extant. Jebb claimed to have used four manuscripts, but appears to have relied on Combach’s text. In 1897, Bridges used two manuscripts (Dublin and Oxford) and consulted three others. These two Mss. were late and not very reliable. Lindberg’s judgment on the inadequacy of these editions, especially that of Bridges, is, alas, only too true: “My text, found below, corrects the texts of Combach, Jebb, and Bridges in perhaps a thousand readings (my italics)—many of modest significance, but others crucial to an understanding of Bacon’s intent.”Further, a major difficulty arose in regard to the important geometical figures [End Page 133] which are closely linked to the argument in the text. The printed editions were much less adequate than the scribal manuscripts.There is just one translation of the Perspectiva into English, that done by Robert Belle Burke (Philadelphia, 1928). This translation, based on Bridges’s deficient text, was very unsatisfactory.Lindberg used twenty-three of the thirty-nine extant manuscripts, and has examined all of the thirty-nine manuscripts. This enabled him to identify five manuscript families. Six early manuscripts representative of the major families were used as the base text and were fully transcribed. Three manuscripts represent version 1; the four other families are represented by one manuscript each. Eight more manuscripts were used with some frequency, and sparing use was made of another nine manuscripts. A further sixteen manuscripts were not used since they were very late or were fragments.The relationship between the manuscripts is so complex that the editor declined to construct a stemma codicum. He did this with good reason. Bacon had a working practice of producing multiple versions of the same text and this makes for difficulties. In the case of the Perspectiva, however, it would appear that the major differences in text seem to be limited to the Preface and to section 1.9.1. Examples of these are provided in Appendix 1 and 2 of the edition. It would seem then that a stable text of the Perspectiva existed from the beginning, and that minor editorial changes were made only in the Preface and at 1.9.1. Further, in the introduction (xiii), Lindberg notes: “It [the Perspectiva] may have been written about 1263, as Easton guesses.” Still, a question remains open: To what extent was the text itself altered by Bacon between 1263 and 1268 in preparation for Pope Clement IV? Was there not an evolution in the text by way of correction, emmendation, addition?An examination of MS. P (Paris, Bibliothèque National, MS Lat. 7434) [= 18 in Lindberg’s list, p. ciii] would, in my estimation, provide grounds for the belief that family 5 (“Hic aliqua dicenda sunt de perspectiva”) may well be an edited version of family 1 (“Positis radicibus”). That is, the (“Hic aliqua dicenda”) may have been intended as part of the text and not just as a Preface. Further, I now believe that the traditional dating of...

Philosophy of Religion for a New Century represents the work of nineteen scholars presented at a conference in honor of Eugene T. Long at the University of South Carolina, April 5-6, 2002. This volume is a good example of philosophy in dialogue; there is both respect and genuine disagreement. First, an account of our present situation in the Philosophy of Religion is given, leading to a discussion of the very idea of a 'Christian Philosophy' and the coherence of the traditional concept of God. The implications of science and a concern for the environment in our concepts of God are carefully examined. A discussion follows on the possibility of speech about God and silence about God. Since much of modern European philosophy is concerned with the `Death of God' theme, the positions of Nietzsche and some of his twentieth-century interpreters are presented. There are presentations on Feminist Approaches to Philosophy of Religion, and Comparative Religion is examined in relation to cultures and the demands of rationality. The volume concludes with a critical dialogue on the relation of Religious Discourse to the Public Sphere. Developing global awareness has led to significant change in the Philosophy of Religion. One-dimensional approaches have given way to honest dialogue. The traditional boundaries between the secular and the religious have shifted, and new approaches to traditional problems are required. This volume presents examples of these new approaches.