50 

 currents nay be seei^. at tinos in these ':'onnectinp fila- 

 nentn. Their function does not seem to be clearly knov/n; 

 but it very nrcbably is conecte.: v/ith a read I'ust-ient of 

 the cytO'-las"i and the establish^-ent of an equilibrium^ be- 

 tween the different blasto-^eres. 



Hargitt in his naoer on "The Early Develo'-^ent of 

 i^n.'ili^ tiar ell a" disoussos the occure-^ce of na-illae, 

 threads, a-^d bridges; c.r^cl reviev.'S briefly the observations 

 of a nuirber of other investigators in regard to these Phenom- 

 ena, and the ryto^lartic activities v;hich they have seen to 

 tal:e nlace in the eggs of a number of animals widely separ- 

 ated nornhol-gically. I:o definite conclusions are rea-hed 

 as to the functions of these various Phenomena, but it is 

 generally -.bought that ^.hey are concerne.i with fundamental 

 intrinsic changes within the cytonlasm. 



These nrotonlasTiic connections are usually comnosed of 

 the ectosarc only. They are nresent -^ot only in the two- 

 celled stage, but. in several of the followintr stages as well 

 As the number of cells increases the :^cnnecting fil-s be- 



