Miscellaneous Scientific Intelligence. 291 



a limited space and in the present state of our knowledge. In all 

 cases the bearing of the cytological facts on problems of general 

 biological interest is emphasized. The chapters on natural and 

 artificial parthenogenesis, sex determination, germ-cell determin- 

 ants, development and heredity show not only how these phe- 

 nomena are associated with definite cell organs, but also how little 

 is yet known of the many subtle problems involved. The evi- 

 dence on which the author's conclusions are based is supported 

 by excellent reproductions of the figures of the original investiga- 

 tors, w. R. c. 



5. A Laboratory Manual of Invertehrate Zoology; by Oilman 

 A. Drew. Third edition, revised ; pp. ix, 229. Philadelphia . 

 and London, 1920 (W. B. Saunders Co.).— This well-seasoned 

 work is the outcome of the experience in teaching large classes at 

 the Marine Biological Laboratory for many years. It represents 

 the combined efforts of a number of instructors, for the original 

 manual has been modified from time to time and new topics added 

 until the present edition contains carefully prepared and really 

 usable directions for the laboratory study of nearly a hundred 

 different animals, embracing all the invertebrate phyla. 



With so large a number of types for selection, the book can be 

 adapted to the needs of both extensive and briefer courses in any 

 part of the country simply by omitting those forms which are 

 unavailable or thought to be less essential for study, w. R. c. 



6. Considerations sur I'Etre Yivant: premiere partie. Resume 

 Preliminaire de la Constitution de t'Ortholionte; par Charles 

 JiVNET. Pp. 80, with 1 plate. Beauvais, 1920 (A. Dumontier). — 

 This is a brief summary of the hypotheses relating to the origin 

 of life and the phylogenetic evolution of the primitive living sub- 

 stance into the various groups of plants on the one hand and into 

 the metazoa on the other as indicated by their reproductive pro- 

 cesses. The ingenious schematic diagrams make the author's 

 conclusions easy of comprehension. w. r. c. 



7. Collection les Maitres de la Pensee Scientifique; publics par 

 les soins de M. Solovixe. Paris, 1920 ( Gauthier- Villars et Cie). 

 — The object of these publications is to make available in inex- 

 pensive form (about 3 francs) the classic works on which the 

 various sciences are founded. The list will include the most 

 famous productions of all times and of all countries, those orig- 

 inally written in other languages to be faithfully translated into 

 French. A brief biograhical notice accompanies each work. 



Two of the volumes already issued are reprints of Spallanzani 's 

 Observations ei Experiences faites sur les Animalcules des Infu- 

 sio?is from the Geneva edition of 1786. A third includes the 

 Lavoisier's classic Memoir es sur la respiration et la' transpiration 

 des Animaux (1777). -w. r. c. 



8. Practical Bacteriology, Blood Work and Animal Parasitol- 

 ogy. Sixth Edition; by E. R. Stitt. Pp. xi, 633. Philadel- 

 phia, 1920 (P. Blakiston's Son & Co.).— This is a manual for 

 laboratory workers which has proved its usefulness in five pre- 



