706 
J. P. Munson 
couception of a cell represented in his text fignre one, is probably the 
coiTect c-onception, and very emphatically support the conclusions of 
Munson (61) expressed in 1898 in his work on Limulus as follows: “I will 
only invite a comparison of some of the forms represented in the plates 
with the sphere in sperrn teils of the Salamander as fignred by Rawitz, 
by Me wes, and in nerve cells by Lexhossek. Such a comparison will 
only serve to strengthen the c-onviction, that the vitelline body is indeed 
a sphere, which not only possesses the typical form of a centrosphere, the 
many forms of the real aster found in dividing cells, in leucocytes, 
and in the fertilized egg of Ascaris megalocephala, but also the less 
typical forms observed in sperm cells as Xebenkern, and in the resting 
ganglion cells. ” 
„The vitelline body in the ovarian egg of Limulus is genetieally the 
centrosome and sphere of the dividing oogonia, and continues to be the 
centrosome and attraction sphere of the growing ovarian egg.” 
“It would seem that the attraction sphere, centrosome and vitelline 
body are the primitive basis or center of growth of the cytoplasm.” 
M. LovEz(53b) has fignred a yolk nucleus showing astral rays in 
egg of Testudo graeca, other stainable bodies in the cytoplasm he believes 
corne from the germinal vesicle. In sections of a young oocyte of Cliora- 
drius hiaticula , he has fignred a fine sphere, with centrosome in the center 
of the ‘'Masse vitellogene”. In young ovules of canard, he also shows 
fine spheres with astral rays. 
Holländer (36) Claims to have fulfilled the requirements of van der 
Stricht (87), who insisted that to prove the yolk nucleus to be a centro- 
some it would be nec-essary to show its origin from the centrosome of the 
oogonia, and also to show that it beeomes the centrosome of the matura- 
tion spindle. He has shown the centrosome in oogonia of bird’s eggs, the 
division of the oogonia and the origin of the yolk nucleus from the centro- 
some of karyokinesis. Aceording to his own aceount, also, he has shown 
the yolk nucleus in all ooc-ytes during period of growth. In later stages 
he has seen the masse vitellogene in the center of which one occ-asionally 
sees the true vitelline body. 
In this connection Lams’ (52) work is also interesting. He says: 
“J’identifie le corps vitellin avec la sphere attractive qui subsiste dans 
l’ovide apres la derniere mitose des oogonies.” Also : “Le corps vitellin de la 
grenonille decrit jusqu’ici par tous les auteurs sous Faspect d'un anias gra- 
nuleux situe dans le cytoplasm oviüaire, pris de la vesicule germinative, 
n’est pas le corps vitellin veritable: c’est la masse vitellogene, et celle-ci 
renferme en son sein le corps de Balbiani proprement dit.” 
