374 



Dr. J. O. W. Barratt. 



[Apr. 4, 



shown in fig. 2. In this form the number of the individual chromosomes 

 which could be distinguished ranged between 28 and 32, while in the testis, 

 taken for comparisou, the number of chromosomes which could be recognised 



Fig. 2. — Normal Somatic Mitosis in Testis of Eabbit. 



lay between 28 and 36. In the somatic mitoses of the ear of the rabbit, 

 after injection of scharlach K, the chromosomes appear larger and coarser 

 than in the testis, but are otherwise of the same type. 



In addition to the above, another type of mitosis, shown in fig. 3, is 

 met with less frequently than in the former. Here the chromosomes, instead 

 of being curved rods, mostly assume the form of large spheroidal or 

 ellipsoidal masses, taking the stain chiefly in their peripheral layer and to 

 a less extent centrally ; some of the chromosomes, however, form short 

 rods, straight or curved, occasionally swollen at the extremities ; again, some 

 of the chromosomes form long rods (two such are shown in fig. 3, one thick, 

 one thin). All these chromosomes are arranged in pairs, with or without 

 connecting threads of chromatin, in the same manner as the so-called 

 gemini of the first maiotic division of the testis (fig. 4), with the exception 

 of the two last mentioned, which are evidently equivalent to pairs, though 



