\i. ri:<.i,r(T8. 



\work, .-iml nucl-eoli. Til-- nuclear liquid is more 



fluid than the yolk, in tin- fresh condit ion usually a> el--ar U v. 



ami \shen coainilat . '1 by tli" 



a little or no colonii',' matter. It i 



*i/" / 'amenta (/,//. \\hich attach themselves to th-- n 



membrane. In this mtuork an- enclos- d // //</, -,,//.. ,p germinative 

 Spots (/;/'). small, t'oi tin- ni"M part spherical. lion 

 struct uns. which consist of a substanc" akin to j, t , 

 suhstancc or nuelein. .V/"-/< /// is di.-t in.irnishahlf t'n.m : -in 



in addition to tvrtaiu othn- i-hi-inical i csprciallv l\ 



fact that it absorbs with irroat 

 avidity pi^nn uts >nch Bl car- 

 mine. ha-matoxylin, anilim-. 

 in account of which it ha> 

 also reccivi il from FI.I:MMIN<; 

 the name chroma tin. 



The niniili'i' <>/ the nucleoli 

 in the ifrrminative vesicles of 

 different animals is highly 

 '.nriahh-. but it is toll rahly 

 constant for each spicies; 

 sometimes there is only a 



, i | Fie. 2. Oenninative vesicle of a Fror's err that 



Bingle Qocleolufi present itill gmall Md immature . It \ ll .,* 



(tii:. 1;, sometiims there are "" 



. (*/"). in :i tiiK- iiuck-:ir network (ivu. 



Pftl OT even very many of clear i.u-i.,i. 



them (fig. 2^/). Accordin-ly 



one may with AUERBACH distinguish nninucleolar, plurinuch'olar. 



and mnitinncleolar germinative venoles. 



At their surfaces eggs are surrounded hy protective envelopes, the 

 number and condition of which are exceedingly variable throu:liout 

 the animal kingdom as well as ainonir \ It is best to 



<li\ide them, as LUDWIG has don.. ig to their method of 



origin, into two groups, into tin- /'/-//////ry .-. nd the secondary egy- 



f>ranes. rrimary e:,i:-memhran. > are su-h as have been 

 duced either by the egg ii> If or by the follicular e. 11> wn hin t he . 

 and the i g-follide. Those produced by the yolk of the r^ are 

 calh-d vitt'Hine membrane] those formed by the follicular epithelium. 

 cliorion. All which take their origin out>ide of tin ;\& a 



result of secretions on the part of the wall of the o\iduct. are to be 

 designated as secondary egg inembi., 



In their details the eggs of the various sp< .nimals ditler 



