76 yournal of Comparative Neurology and Psychology. 



The NissL bodies are aggregates of extremely minute particles 

 and exhibit marked resistance to degenerative changes. They 

 actually exist in the living nerve cell. Those occurring in Limax 

 are always found within the limits of the cytoplasmic vacuoles. 

 They can be caused to appear in the cell by rest and feeding and 

 can be made to disappear through hibernation, fatigue and elec- 

 trical stimulation. They are probably of a fatty nature. 



5. Pigment granules are found very generally in molluscan 

 nerve cells. They do not readily respond to starvation experi- 

 ments, can be increased in size and number through feeding, are 

 practically unchanged by fatigue or electrical stimulation, but do 

 show occasional variations in size and number. These bodies 

 respond to the tests indicated for lipochrome substances or fats. 



6. The centrosome has been described in many of the inverte- 

 brate nerve cells, but there is considerable doubt as to its persist- 

 ent presence in adult nerve cells. 



BIBLIOGRAPHY. 



Adamkievicz, a. 



Der Blutkreislauf der Ganglienzclle. Hinchwiild, Berlin. 1886. 

 Altmann, R. 



Die Struktur des Zellkerns. Arch. f. Anat. u. Entwickel. 1889. 



Elementar Organismen und ihre Beziehung zu den Zellen. Leipzig. 1890. 



Ueber Granula und Intergranular Substanzen. Arch. f. Anat. u. Physiol., p. 360. 1895. 



Ueber das Wesentliche in der Zelle. Arch. f. Ana . u. Physiol., p. 423. 1896. 

 Amuronn, H. und Held, H. 



Beitrage zur Kenntnis des Nervenmarkes. Ueber Entwickelung und Bedeutung des Markes. 

 Arch. f. Anat. u. Eutzvickl., p. 202. 1896. 

 Anfimow, J. A. 



On changes in the central nervous system of animals due to varnishing the skin. Vrach., St. 

 Petersburg, vol. 7, p. 689. Rus. 1886. 

 An GLADE, D. 



Sur les alterations des cellules nerveuses de la cellule pyramidale en particular dans la paralysie 

 generale. yf wn. Me^. Pi^icAo/., Ser. VIII, vol. 8, pp. 40-46. 1897. 

 Apathy, S. 



Ueber Neurofibrillen und ihre nervos Leitendenatur. Prvc. 4th Intern. Zool. Congress. Cam- 

 bridge, pp. 126-1^1. 1899. 

 Apolant, R. 



Ueber die sympatischen Ganglienzellen der Nager. Arch. f. Mikr. Anat., Bd. 47, p. 461. 

 1896. 

 Arnold, Julius. 



Bemerkungen eines Beteiligten iiber Spiralfasern und Fadennetze an den Ganglienzellen des 



Sympaticus. Anat. Anz., vol. 5, p. 204. 1890. 

 \V. Flemming und die "Mitomlehre.'' Anat. Anz., vol. 16. p. 607. 1899. 

 Weitere Beobachtungen iiber "vitale'' Granularfarbung. Anat. Anz.,\'o]. 16, p. 568. 1899. 

 Ueber Struktur und Architektur der Zellen. I, II, III. Arch. f. Mikr. Anat., Bd. ^2. 1898. 

 Ueber "vitale'' Granularfarbung in den Knopelzellen, Muskelfasern und Ganglienzellen. 

 Arch. f. Mikr. Anat., Bd. 55, pp. 479-488. 1900. 

 Athias, M. 



La vacuolization des cellules des ganglions spinaux chez les animaux a I'etat normale. Anat. 

 Anz., Bd. 27, p. 9. 1905. 



