PLATES 
The following are drawn at a magnification of approximately 3100 diameters: 
Figures 40, 41, 42, 62, 63, 64, 96, 97, 98, 99, 101, 131, 132, and 133. All other draw- 
ings are made at a magnification of 2800 diameters. The figures have been 
reduced one-third in reproduction. 
All the drawings on any one plate are from.a single individual; the number 
of the individual is placed at the top of the plate in the center. Each drawing 
has three identification marks, thus a The number above (1) is the serial 
number of the drawing. The letter (B) indicates which follicle of the particular 
testis the complex is from. The number (8) to the right of the letter locates 
the cyst. In the example given, figure 1 is a drawing of a chromosome complex 
in cyst 3, follicle B, of individual 950. Hence in the plates it is an easy matter 
to identify the complexes from the same follicle or cyst. 
In most first spermatocyte complexes drawn the chromosomes have been 
serially arranged according to size. In such drawings the elements from a 
single complex are placed in a horizontal row, while the homologous chromo- 
somes from different complexes appear in vertical columns. The number of the 
drawings, with the follicle and cyst from which they are taken, are placed at 
the left and the numbers of the chromosomes at the top. The serial arrange- 
ment is only approximate for some elements. The smallest two and the largest 
two are clearly differentiated from all the rest. Chromosomes S, 3 and 4 can 
be recognized by their size and certain peculiarities in form and behavior. 
But it is not possible to identify accurately elements 5, 6, 7, 8, 9, 10. 
No. 4 is the accessory, which, as indicated, usually does not have as smooth 
an outline as the others. The accessory is labeled X in some drawings. In 
drawings in which the first spermatocyte elements are serially arranged, the pole 
toward which the accessory is passing is represented by the top of the page. 
The supernumerary, whether single, paired or triploid, is indicated by S; the 
chromatoid body and chromatoid granules by C. 
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