IO CALIFORNIA ACADEMY OF SCIENCES. [3D Ser., 



I can add only a few words as regards the nucleus. The 

 nucleus varies in size considerably, but not so much as the 

 cytoplasmic part. The shape of the nucleus varies more 

 than its size; thus many nuclei are round, while others are 

 oblong. The former are represented by figs. 10 and 20, 

 the latter by 7, 8, 9, and 11. 



I have already stated that with metanil yellow and thionin 

 part of the cytoplasm can be stained enough to show ex- 

 actly the same general structure as the fusiform corpuscles, 

 of which more further on. Of the details of the nucleus 

 I have made no particular study, but I find that it possesses 

 the same polarity as that described by Heidenhain. (See 

 diagrams given in his "Kern und Protoplasma," Taf. ix, 

 fig. 8.) 



The Fusiform Corpuscles. — A more detailed description 

 of these will be given further on. Here I will only state 

 that they occur in large numbers and are more numerous 

 than even the nucleated red blood cells. They are found 

 in all stages of degeneration and disintegration. 



Leucocytes with Polymorphous Nucleus. — These are found 

 in varying numbers. In some specimens they are much more 

 numerous than in others. In figs. 14 to 19 I have shown 

 some types, each displaying a pronounced microcentrum 

 which in a general way resembles those described by Heid- 

 enhain, only the microcentrum is surrounded by a small, 

 deep-staining, starlike sphere, which sometimes separates 

 the centrosomes and the centrospheres from each other. 

 A somosphere I have not with certainty observed. Stained 

 with Ehrlich-Biondi, the fine connections between the lobes 

 of the nucleus do not become visible. These fine connec- 

 tions are, however, brought out with toluidine, showing that 

 the various parts of the nucleus are in reality connected. I 

 have never seen entirely isolated parts. These fine connec- 

 tions frequently show one or two minute triangular nodes of 

 very characteristic form, but I have not given them any par- 

 ticular study and wish only to call attention to them. These 

 leucocytes vary but little in size. Two of the figures, 19^ 

 and 19c, represent polymorphous leucocytes stained with 



