ANDREWS. 



[Vol. II. 



In the lower part of the figure a cell to the left has reached 

 out over one to the right and established a connection with it 

 by means of a broad strand of filaments. An earlier stage of 

 a similar process is shown above, where the same left cell is 

 strongly bound to an upper cell by double strands of filaments. 

 These filaments seem instrumental in drawing the cells together 

 to cover in the cleavage pore. This figure is reduced one-half 



and otherwise like the first in execution, except that it was 

 drawn with oc. 6. 



In both these figures the thickness of the finer filaments is 

 exaggerated in drawing, and hence they do not adequately indi- 

 cate the delicacy of these processes. Moreover, as they are 

 constantly changing, and as they contract and draw in when 

 stimulated by certain chemicals or even by mechanical insult 

 to the egg, it is plain that usual methods of preservation will 

 fix but part of these displays, at the most, and that they may 

 be readily broken off in subsequent treatment. However, it 

 was found possible to preserve some of the larger filaments or 

 amalgamations of filaments by special methods, and intercellular 



