282 BIOLOGICAL LECTURES. 



male. While we are able to produce the process of fertilization 

 by a treatment of the unfertilized egg with certain salts in 

 certain concentrations, we cannot hope to bring about the trans- 

 mission of the hereditary qualities of the male by any such 

 treatment. Hence, the inference must be that the transmis- 

 sion of the hereditary qualities of the male and the agency that 

 causes the process of fertilization are not necessarily one and 

 the same thing. I consider the chief value of the experiments 

 on artificial parthenogenesis to be the fact that they transfer the 

 problem of fertilization from the realm of morphology into the 

 realm of physical chemistry. 



BIBLIOGRAPHY. 



1 . The historical data are taken from Hensen's Physiologic der Zeugung. 



(Hermann's Handbuch der Physiologic. Bd. vi.) 



2. HERTWIG, O. Die Zelle und die Gewebe. p. 239. Jena, 1893. 



3. LOEB, J. Experiments on Cleavage. Journ. of Morph. Vol. vii. 



1892. 



4. MORGAN, T. H. The Action of Salt Solutions, etc. Arch. f. Ent- 



ivickelungsmechanik. Bd. viii. 1899. 



5. NORMAN, W. W. Segmentation of the Nucleus without Segmentation 



of the Protoplasm. Arch. f. Entivickelungsmechanik. Bd. iii. 

 1896. 



6. MEAD, A. The Rate of Cell-Division and the Function of the Centro- 



some. Woods Holl Biol. Lect. 1898. 



7. LOEB, J. On lon-Proteid Compounds and their R61e in the Mechanics 



of Life-Phenomena. Amer. Journ. of Phys. Vol. iii. 1900. 



8. LOEB, J. On the Artificial Production of Normal Larvae from the 



Unfertilized Egg of the Sea Urchin. Amer. Journ. of Phys. 

 Vol. iii, 



9. GEMMILL. The Vitality of the Ova and Spermatozoa of Certain 



Animals. Journ. of Anat. and Phys. 1900. 



10. LOEB, J. The Heredity of the Marking in Fish Embryos. Woods 

 Holl Biol. Lect. Boston, 1 899. 



