186 



ROBERT T. HANCE 



able for study, since any conclusions based on such material 

 are not only open to criticism, but are very probably wrong. 

 A form possessing so large a number of chromosomes as the pig 

 enclosed in so small a compass must, indeed, be prepared with 

 the greatest care if results of any value are to be obtained. 



It is possible to show more conclusively that the diploid chro- 

 mosomes of Wodsedalek's pig possess the same amount of 

 chromatin as I have described for the number of individuals 

 studied. If a fusion between adjacent chromosomes, or per- 

 haps between pairs, has occurred, the total length of the chromo- 

 somes in Wodsedalek's figures should be about one half the 

 length I have found. Furthermore, the chromosomes (provided 

 the magnification was the same) should average about twice the 

 width of those figured in this paper. It seems probable that, 

 however much the widths may have been effected through poor 

 fixation, the lengths may not have been greatly disturbed, or, 

 if they were shrunken, the shrinkage would affect all alike. 

 Consequently I believe that the measuring of these chromo- 

 somes may be relied upon to give fairly accurate results. The 

 chromosomes of the four figures in his paper were copied and 

 enlarged six times over the published size as carefully as possible 

 with the following results. 



The length of the chromosomes in the figures of the diploid complexes published in 

 Wodsedalek' s article on the spermatogenesis of the pig {'13) 



Spermatogonium . 



Oogonium 



Mesonephros 



Mesonephros. . . . 



FIGURE 

 NUMBER 



18 

 60 

 59 

 62 



Average . 



NUMBER OF 

 CHROMOSOMES 



18 

 20 

 18 

 20 



TOTAL 



LENGTH X 6 IN 



CENTIMETERS 



56.5 

 49.2 

 44.3 

 47.6 



49.6 

 or approxi- 

 mately 

 50 cm. 



The magnification used by Wodsedalek was about one third 

 less than that I have employed. Consequently one third must 



