252 RECENT CYTOLOGY 
their appearance immediately before the process of 
division, are found with their extremities situated in 
little pockets or bulgings of the nuclear membrane, 
so that their exact position is very definitely marked ; 
and the arrangement of the chromosomes may be any 
one of those already indicated. Boveri observed that 
BLE YK 
FIG. 27. FIG. 28. FIG. 29. 
in the case of two neighbouring cells which had 
originated by the division of the same mother-cell, the 
chromosomes made their appearance in both cases in 
the uncommon position of Fig. 29. Figs. 30 and 31 
indicate their actual arrangement. The conclusion to 
be drawn from this observation is that the same 
chromosomes have preserved their individuality right 
through the resting stage of the nucleus, to reappear 
in the same position at the outset of a new phase of 
division. 
It is believed, then, that the same stages which the 
chromosomes passed through at the close of one 
