390 
J. F. McClendon 
described (09, 1) the flattening of the mitotic figiires in tlie direction of 
the centrifugal force. In some cases the yolk and pigment is piled up upon 
the spindle, as shown in fig. 5, which represents a cross section of the spindle 
containing the ecpiatorial plate. The longer the eggs remain in the centri- 
Fig. 8. 
Two groaps of diromosomal resicles, abnormal or incipient nnclei, indicatiog division of nnclei witbont 
cytoplasmic division, in an oblique section very near tbe animal pole of an egg of Raita pipiens that 
was placed in the ceutrifuge in the eight cell stage, centrifugal force = 505 X gravity for d'/a hours. 
fuge the greater the abnormalities in the mitotic figures. Supernumerary 
asters appear, that are probably the products of the division of the asters 
of the mitotic figures. Fig. 6 represents the chromosomal vcsicles sur- 
Fig. 9. 
From a section lower down, in the egg shown in fig. 8, representing numerons asters in division and 
far removed from any chromatin. 
rounded by four asters in an egg centrifnged 45 minutes. Fig. 7, from 
the Same egg, represents a nucleus with two asters, but nearby is a thh'd 
aster which is apparently a product of the di\nsion of one of the asters 
connected with the nucleus. Fig. 8 shows two masses of chromosomal 
