314 MONTGOMERY. [Vol. XV. 



wander into the cytoplasm. Salamandra maculosa, larvae : 

 the " Urei " has a single large nucleolus. Bufo cinereus, larvae 

 of several months : concludes " dass die Keimflecke, wenn noch 

 winzig klein, aus den Knotenpunkten des Spongioplasmas 

 entstanden sind, und nachdem sie eine gewisse Grosse erreicht, 

 die Form und Sonderung einer Amobe besitzen. Dieselben 

 stellen sich jetzt dar wie hiillenlose, kleine Zellen, ai* denen wir 

 einen homogenen kornigen Korper, der feinzackig oder selbst 

 in feine Strahlen ausgezogen ist, unterscheiden und im Innern 

 einen lichten, kernahnlichen Fleck, in dem sich noch ein Kor- 

 perchen abzeichnet " ; numbers of such nucleoli may later fuse 

 together, " unter Vermittelung ihrer Zackenspitzen." Rana 

 esculenta : in the smallest ova there is only a single large 

 nucleolus, with a vacuolar central portion and peripheral 

 radiating strands ; in larger eggs there are a number of smaller 

 nucleoli, each of which has the same structure as the primitive 

 one ; Leydig believes that nucleoli wander out of the nucleus, 

 since he found a granular mass on the outer surface of the 

 latter. The ova of Sus scrofa, Myoxus nitelay and Talpa euro- 

 pea contain each a single nucleolus. 



Lukjanow ('88) investigated the stomach mucosa of Salaman- 

 dra. There are several, usually club-shaped nucleoli (" Nucleoli 

 claviformes"), the smaller, often funnel-shaped, end of which 

 is in contact with the nuclear membrane. He concludes 

 " dass die kolbenahnliche Form des Nucleolus . . . auf eine 

 Vorbereitung zur Inhaltsentleerung hinweist. Der Kolben 

 entleert seinen Inhalt etwa ebenso, wie die Becherzelle ihren 

 Schleim entleert " ; and he supports this conclusion with the 

 observation that a mass is often found on the outer surface of 

 the nuclear membrane which stains like the nucleolus. 



Nagel ('88) studied the human Q^g. The " Primordial-Ei " 

 has a single nucleolus ; those which contain no nucleoli he 

 believes do not develop further. In the ripe ^gg amoeboid 

 motions were noticed in life (studied in liquor folliculi). 



Sanfelice ('88) terms the nucleolus of the spermatoblast 

 "nucleus," and the nucleus, "cell." What he calls the nucleus 

 then divides karyokinetically (but that this process is a division 

 of the nucleolus may be deduced from his figures 6o and 62). 



