196 
CHARLES L. PARMENTER 
the criteria adopted are not entirely satisfied. There is a chance 
of doubt, therefore, of the validity of the pairs as indicated. 
As mentioned above, it will be noted that the groups into 
which the chromosomes of this cell are associated are repeated 
in the other cells. The similarity of grouping is very marked, 
especially in the formation of two large and distinctly separated 
groups, one containing pairs 3 to 7 and the other pairs 9 to 14. 
In pairs 3 to 7 of figure 34 the condition present in figure 33 is 
duplicated, except that pair 3 is not so well separated from pair 
4, due to the fact that both homologues of pair 4 are relatively 
shorter in the former complex. Concerning the homologues of 
pair 6 there is some doubt. I have interpreted the end of 
chromosome 30 + (fig. 28) as bending back upon the main 
portion of the chromosome, and have estimated the length of 
this portion. 
Of the remaining six pairs (9 to 14) in both cells several are 
quite clear, but on the whole the possibilities of error and the 
differences in length between successive pairs is too small to 
satisfy the second criterion fully. In figure 33, on account of 
the practical absence of twisting in pair 12 and adjacent pairs, 
the condition for determining pairs is very closely satisfied. 
The chromosomes of pair 9 were considered homologues through 
a process of elimination. They differ 12.4 mm. in length, but 
agree in form (fig. 27). This condition will be discussed later 
(p. 217). 
In figure 34, pairs 9, 11, and 13, although not sufficiently 
separated to constitute an unquestionable demonstration of pairs, 
are fairly well separated and the homologues of each pair, after 
allowance is made for errors due to twisting, are of nearly equal 
length. One homologue of pair 10 (fig. 28) is imperfect. Pair 
14 is well separated in the graph from pair 13. Approximate 
corrections made for the kink in the shorter member and for 
the slight foreshortening at that point make its length approxi¬ 
mately the same as that of the longer member. The homologues 
of all these pairs agree very well in form (fig. 28), in spite of the 
fact that some may not yet have assumed their final shape. 
