No. 3] BLOOD-PLATES OF THE HUMAN BLOOD. 66 1 



EXPLANATION OF THE FIGURES. 



Figs, i, 2, 17, 18 are from preparations stained with eosin-haemalum. Figs. 

 3, 16, 19, 21, stained with toluidine. Figs. 23-27, metanil-yellovv ; polychromes- 

 methylen-blue. Fig. 20, the same as the last, but with after treatment of weak 

 oxalic acid in water. Figs. 28-36, metanil-yellow and polychromes-methylen-blue. 

 Thus-xylol. All were studies with Zeiss, Apo. 3 mm., Apt. i : 40, Ocs. 8 and 12. 

 Figs. I, 2, 22, 23, 26, 27, 30, 33, 36, projection on table. All the other figures are 

 drawn to a larger scale, in order to be more distinct. Figs. 22-24, 3° drawn from 

 Zeiss D., Oc. 4. 



The onlylight used was that passed through the light filter previously described; 

 daylight being very unsatisfactory. 



EXPLANATION OF PLATE XXXV. 

 Plasmocytes, or Blood-Plates^ from Human Blood. 



Fig. I. A group of plasmocytes, partly surrounded by free protoplasm of 

 doubtful nature. Some of the plasmocytes are free, all possess cytoplasmic pro- 

 jections. The white centers are highly refractive, unstainable granules. The dark 

 field surrounding them contains the archosomal zones, such as centrosomes, cen- 

 trosphere, etc. The red-colored parts contain the cytoplasmic spheres, with 

 longer or shorter cytoplasmic filaments. 



Fig. 2. Another group of plasmocytes, or blood-plates, of the human blood. 

 The plasmocytes are adhering to each other, but there is no diffuse protoplasm. 

 The details are as in Fig. i. 



Fig. 3. A free plasmocyte. In the two outer .spheres we can recognize the 

 plasmosphere and the unstained hyalosphere. The granosphere is stained dark 

 violet. The centrosphere is white, and the centrosomes, with presumably a somo- 

 sphere, are stained dark. 



Fig. 4. A plasmocyte with two separate groups of centrosomes, between them 

 a paler centrosphere. 



Fig. 5. A plasmocyte with a large refractive granule, a paler centrosphere 

 with centrosome. Another centrosome lies outside of the granosphere, and out- 

 side the latter are the other cytoplasmic spheres, not separable from each other. 



Fig. 6. A plasmocyte with iour central centrosomes and three centrospheres, 

 one of which contains a centrosome. 



Fig. 7. A plasmocyte with two centrosomes, surrounded by a food, or ferment, 

 granule. The dark zone is the granosphere ; the two outer paler zones, the cyto- 

 plasmic spheres. 



Fig. S. a plasmocyte with a very large central granule, at the edge of which 

 is seen a centrosome. The granosphere is dark ; the outer cytoplasmic spheres 

 are pale blue. 



Fig. 9. A group of plasmocytes of different sizes illustrating the variation in 

 form and size. The largest plasmocyte with two groups of centrosomes, three of 



