26 THE AEEANGEMENT OF THE 



looks traversed by delicate radiating spokes, lost to sight in the 

 colored portion of the blood-corpuscle. 



The specimen shows numerous free bodies of the aspect of 

 nuclei of red blood-corpuscles, and the surface of many of such 

 bodies is beset with pointed, as if irregularly torn, filaments. 

 Besides, there are globular bodies in smaller number, which 

 decidedly surpass the size of 'these, though they are coarsely 

 granular, and inclosed by a shell, like the nuclei. Neither of 

 these formations exhibited locomotion at the ordinary tem- 

 perature of the room. 



Colorless Blood-Corpuscles of Man. I have transferred to the 

 heating stage my own blood, which I took from a small prick of 

 the palmar surface of the thumb. No structure was recognizable 

 in the shining colorless corpuscles at the temperature of the 

 room. As soon, however, as the temperature of the specimen 

 reached about 30 deg. C. (86 deg. F.), the colorless blood-cor- 

 puscles I mean the finely granular ones, resting in plasma 

 encircled by red blood- corpuscles always exhibited the follow- 

 ing features : 



In the center of the corpuscle one or two gray, opaque, homo- 

 geneous lumps made their appearance. From every lump 

 emanate radiating conical spokes, which unite the two lumps, 

 when such exist, or which are directed toward the periphery of 

 the body and inosculate with a net- work traversing the whole 

 corpuscle a net- work the points of intersection of which appear 

 slightly thickened, in the shape of nodules, or granules. On the 

 periphery of the corpuscle the reticulum is inclosed by an 



apparently continuous, somewhat 

 shining, layer. The central lump, 

 the spokes, and their nodules are 

 identical in their optical features, 

 while the mesh-spaces give the im- 

 pression of light, structureless 

 fields. (See Fig. 2.) 



As the temperature of the speci- 

 men rises gradually toward 35 deg. 

 C. (98 deg. F.), continuous changes 

 FIG. 2. DIAGRAM OF A LIVING of shape occur, both in the central 

 COLORLESS BLOOD-CORPUSCLE. lump and in the net-work of the 



corpuscle. Simultaneously with 



changes of the shape of the latter, a smaller or greater portion 

 of the central body at times is transformed into a reticulum, 



