114 THE BLOOD 



less corpuscles of spontaneously changing their shape was first demonstrated 

 by Wharton Jones in the blood of the skate. If a drop of blood be examined 

 with a high power of the microscope, under conditions by which loss of mois- 

 ture is prevented, and at the same time the temperature is maintained at 

 about that of the body, 37 C., the colorless corpuscles will be observed 

 slowly to alter their shapes, and to send out processes at various parts of their 



\ 

 C 



FIG. 116. (a) Red blood- corpuscle for comparison; (b) small hyaline cell or lymphocyte; 

 (c) large hyaline cell or myelocyte; (d) fine granular oxyphile; (e) coarse granular oxyphile or eosino- 

 phile; (;) basophile. (F. C. Busch.) 



circumference. The ameboid movement which can be demonstrated in 

 human colorless blood-corpuscles, can be most conveniently studied in the 

 newt's blood. Processes are sent out from the corpuscle. These may be 

 withdrawn, but more often the protoplasm of the whole corpuscle flows 

 gradually forward to the position occupied by the process, thus the corpuscle 

 changes its position. The change of position of the corpuscle can also take 

 place by a flowing movement of the whole mass, and in this case the loco- 



FIG. 117. Human Colorless Blood-Corpuscle, Showing its Successive Changes of Outline Within 

 Ten Minutes when kept Moist on a Warm Stage. (Schofield.) 



motion is comparatively rapid. The activity both in the processes of change 

 of shape and also of change in position is much more marked in some cor- 

 puscles than in others. Klein states that in the newt's blood the changes 

 are especially noticeable in a variety of the colorless corpuscle, which consists 

 of a mass of finely granular protoplasm with jagged outline and contains 



