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Development of the Embryo in the Egg of Toxoptera graminum. 
g. 1.— Sagittal section of the embrvu showing tin- segmentation. The invagination oMhesalivaiy glainls is now fvi.leni ._ The 
-Mini!.- :!iapc an<! )i;i vr sliifl r<| jti posilion. Throvai iali vulk is giiMllv change.] in ;i) >| m;u a in ■■' :m<l hurt tsikeji up a posilion ;ii 
The "polar organ " nmv shows a hii ge, sun lewhal pear-shape-l rciilral eavif\ uhirh upi-'iis upon I lies 
diameters. Fig. :'. Sagittal section i 1 1 ■ r J ■ i r 
lion IpV Lending around kicku-ard and in- I" 
The "polar organ " is uiueh Ihesarnc a- in i 
f the egg a 
s) lowing a much more advance I stage ol grow Mi I hall thai, of I 
trian volk. The nieseuleron is in process of fui mixtion. The ov 
ug stage. Magnified lf.ii diamefers. (Original.) 
