110 



Mr. E. A. Andrews on some 



the mass in the form of delicate flowing currents of living 

 material that form filose pseudopodia. These thread-like 

 processes have the power to unite with or separate from one 

 another, to lengthen or to shorten, to become thick or thin, 

 much as do the pseudopodia of Gromia. By means of such 

 living material spun out from the cells all parts of the young 

 organism are held together as one continuous mass of living 

 matter^ the continuity being established as fast as cell-division 

 tends to interrupt it. 



The polar bodies act like the cells of the cleaving egg, and 

 from the first become organically continuous with the egg- 

 cells by means of living threads spun out from the polar 

 bodies and from the g,^^. 



In figure 1 the polar bodies are represented lying over the 

 relatively large opening that leads into the cleavage cavity of 



Fio-. 1. 



i;:>:--v; 



the many-celled blastula. This figure is from a camera- 

 lucida sketch made in 1894 with Zeiss ocular 8, objective 

 2 millim., and draw-tube 170 millim., by G. F. Andrews, from 

 the living blastula of the Asterias common at RoscofF, 

 France. Under this magnification of more than one thousand 



