426 NATURAL SCIENCE. June, 1894. 



^oes ; but it was felt that it would be equally undesirable to entirely 

 pass over all theoretical speculations. Without some connecting idea, 

 the facts themselves lose much of their interest, and biologists must 

 of necessity pay close attention to such work as Weismann's, even if 

 they have to find subsequently that some new discovery renders that 

 work no longer tenable as affording an adequate explanation of the 

 facts as they stand. Though to some minds Weismann's doctrines 

 may extend into the regions of transcendental science, yet his works, 

 and those of the Hertwigs, Boveri, and other eminent cytologists, have 

 brought home to all an immense and varied field of possible research, 

 the results of which may in the future, as they have done in the past, 

 profoundly modify the position of Biological Science. 



OUTLINE BIBLIOGRAPHY. 



1. Beneden, E. Yan, et Neyt.— " Nouvelles recherches sur la fecondation et 



la division mitosique chez I'ascaride megalocephale." Leipzig, 1887. 



2. Boveri, T. — " Zellenstudien." Jenaische. Zeit. fi'ir NaUtrw., Bd. 21, 1887, 



Bd. 22, 1888, Bd. 24, 1890. 



3. " Befruchtung." Anat. Hefte, edited by F. Merkel and R. Bonnet, 



2«.« Abt., Band i., 1891. 



4. Brauer, A. — ■" Zur Kenntniss der Reifung des parthenogenetisch sicli entwick- 



elnden Eies von Artemia und Branchipus." Archiv. Jiiikr. Anat., Bd. 43, 

 Heft i., 1894. 



5. Fick, R. — " Ueber die Reifung und Befruchtung des Axolotleies." Zeitschr. 



fiir Wiss. ZooL, Nov., 1893. 



6. Flemming. — " Zellsubstanz, Kern, und Zelltheilung." Leipzig, 1882. 



7. "Neue Beitrage zur Kenntniss der Zelle." Archiv. filr mikr. Anat., 



Bd. xxix., 1887, Bd. xxxvii., 1891, etc. 



8. Fol, H. — " Le quadrille des Centres." Archiv. de Sci. Nat. Geneve, 1891. 



9. Hacker, Y. — " Das Keimblaschen, seine Elemente und Lageveranderungen." 



Archiv. fin- mihr. Anat., Bd. 41, 1893. 



10. Henking, H. — " Untersuchungen iiber die Entwickelungsvorgiinge in den 



Eiern der Insekten." Zeitschr. fi'ir wiss. ZooL, Bd. 50, 1890. 



11. Hertwig, O. — " Zelle und Gewebe." Jena, 1892. 



12. " Vergleich der Ei- und Samenbildung bei Nematoden. Archiv. 



fi'ir mikr. Anat., Bd. xxxvi., 1890. 



13. Hickson, S. J. — " The Early Stages in the Development of Distichopora 



violucea, with a short essay on the Fragmentation of the Nucleus." Quart. 

 Journ. Micros. Sci , vol. 35, July, 1893. 



14. Moore, J. E. S. — " Some Points in the Origin of the Reproductive Elements 



in Apus and Branchipus." Quart. Journ. Micros. Sci., vol. 35, Sept., 1893. 



15. Watase, S. — "Studies on Cephalopoda: I. Cleavage of Ovum." Journ. of 



Morph., vol. iv., January, 1891, pp. 247-302. 



16. "On the Homology of the Centrosome." Journ. of Morph., 



vol. viii., May, 1893. 



17. Weismann, A. — "The Germ-plasm" (Con temp. Science Series). London, 



1893- 



18. Ziegler, H. E.— " Die biologische Bedeutung der amitotischen Kerntheilung. 



im Thierreich." Biol. Centralb. ser. xi., pp. 372-389. 



M. D. Hill. 



