382 ANDREWS. [Vou. XII. 
possible to know some portions of the network as distinctively 
the polar bodies’ own. 
The position of the polar bodies, with relation to their dis- 
tance from the egg membrane and the egg itself, varied also 
throughout the time of development up to this point. 
Their substance, like that of the egg, frequently travelled 
to the membrane and there adhered, spinning backwards or 
anastomosing with such egg filaments as happened to be there. 
At time of closure of the cleavage pore, the polar globules 
were shut inside the blastula, chiefly, it seemed, by action of 
the egg processes overpassing them and drawing together the 
cells above them; yet possibly they assisted also by some 
migratory movements of their own. 
Inside the blastula, they could still be followed clearly for 
some time, until at last, after being involved in the web of spin- 
nings from the ectoderm cells and, in the gastrula, from the 
protoplastic ends of entoderm cells, they were finally lost to 
sight in the still further additions given off from the mesen- 
chyme cells. After this point their fate could no longer be 
followed, though it enlisted the strongest interest. 
Towards the time of closure of the cleavage pore an increased 
tendency to viscidity and to organized action of the spinnings 
was shown by the strange geometrical positions maintained by 
the lines of living substance. 
In one instance where the conditions remained stable for some 
moments, a camera drawing was obtained of a certain arrange- 
ment which from a mechanical point of view was remarkable. 
One line of very viscid-seeming protoplasm formed an arc 
which would make part of a very large circle. The ends of this 
terminated in the angles formed by sharp bendings of two long 
rays having their origin in the two polar bodies then lying 
quite apart ; and their termination in two cells of the egg which 
were not adjacent but separated byanother cell. Thus it came 
about that one saw a viscous fluid in linear extension, maintain- 
ing the curve of a distinct arc, yet attached to the angles formed 
by what were, mechanically, four contending directions of ten- 
sion. It might have been open to one to suppose that the 
angled lines were very viscid, and that the arc line was a less 
