144 FOOT AND STROBELL. 



sketch for the investigator's interpretation. One of the criti- 

 cisms of Erlanger's photograph, most commonly heard, empha- 

 sizes the worthlessness of his preparations. Is not this the 

 strongest possible argument in favor of photomicrography ">. 



Woods Holl, October lo, 1898. 



PAPERS REFERRED TO. 



1. Andrews, Gwendolen Foulke. Some Spinning Activities of Pro- 



toplasm in Starfish and Echinus Eggs. Jour)i. of Morph. Vol. xii, 

 No. 2. 1897. 



2. V. Erlanger, R. Beitrage zur Kenntniss der Structur des Proto- 



plasmas, der karyokinetischen Spindel und des Centrosoms. Arch. 

 f. mikr. Anat. Bd. xlix. 1897. 



3. Flemming, W. Zelle. Ergebnisse der Anat. u. Enttuicklungsge- 



schichte, Merkel u. Bonnet. Bd. vi. 1897. 



4. Foot, Katharine. Preliminary Note on the Maturation and Ferti- 



hzation of the Egg of Allolobophora foetida. Joiirn. of Morph. 

 Vol. ix. No. 3. 1894. 



5. Yolk-nucleus and Polar Rings, foiirn. of Morph. Vol. xii, 



No. I. 1896. 



6. The Origin of the Cleavage Centrosome. Journ. of Morph. 



Vol. xii, No. 3. 1897. 



7. The Cocoons and Eggs of Allolobophora foetida. fourn. of 



Morph. Vol. xiv, No. 3. 1898. 



8. Mead, A. D. Some Observations on Maturation and Fecundation in 



Chaetopterus pergamentaceus Cuvier. Jonrn. of Mo7-ph. Vol. x, 

 No. I. 1895. 



9. Wilson, E. B. An Atlas of the Fertilization and Karyokinesis of the 



Ovum. Macmillan & Co. New York, 1895. 

 10. ZiEGLER, Heinrich Ernst. Untersuchungen iiber die ersten Ent- 

 wicklungsvorgange der Nematoden. Zeit. f wiss. Zool. Bd. Ix, 

 Heft 3. 1895. 



