I0 6 BLOOD BIOPLASTS, 



just as they are from a clot formed in any of the 

 smaller vessels, and in some instances from a clot 

 situated external to the vessels, and the living bio- 

 plasts (white blood-corpuscles) grow and multiply at 

 their expense. After a time, such is the increase of 

 the latter that the capillaries in many tissues are 

 almost entirely occupied by them. This fact is 

 illustrated by Fig. 36, plate VIII, which represents very 

 small capillary vessels of the mesentery of the com- 

 mon frog in winter. The vessel is almost choked up 

 with white blood-corpuscles, only one or two red ones 

 remaining in the specimen from which the drawing 

 was taken. Another illustration of this fact is given 

 in Fig. 37, plate VIII, which represents some of the 

 capillaries from the bladder of a half-starved frog. 

 The capillaries have much wasted, and contain no red 

 blood-corpuscles whatever, their cavity being entirely 

 occupied by fluid liquor sanguinis and masses of 

 bioplasm, differing much in size, the largest particles 

 having the ordinary dimensions of the white blood- 

 corpuscles, while the smallest are so minute that they 

 cannot be demonstrated under a power magnifying 

 much less than 1,000 diameters. It is remarkable 

 that in this case the white blood-corpuscles are still 

 growing and multiplying, and are, indeed, probably 

 the active agents in the absorption of the tissues. In 

 this specimen taken from the most beautiful and 

 delicate of all the tissues of the frog may also be seen 

 the very fine pale nerve-fibres which I demonstrated 



