BLOOD CELLS, 



67a 



state of the nucleus, the particles of which were either 

 tending to unite with one another, or there was a sepa- 

 ration of the nucleus into several smaller portions. 

 Wharton Jones, however, says there is no subdivision of 

 Uie nucleus. 



If we examine a drop of blood under the microscope, 



Tig. 314. 



1, A i)ortio-n of the web of a Troy's foot, spread out anil slightly magnified to 

 Khow the distribution of the "blood-vessels. 2, A portion magnified 250 dia- 

 meters, showing the ovoid form of the blood-discs in the vessel, beneath 

 which a layer of hexagonal nucleated epithelium-cells appear. 3, Human 

 blood discs, as they appear when fres-h drawn (magnified 250 diameters). 



the corpuscles aggregate themselves together like rolls of 

 coins, fig. 314, No, 3, which present a kind of network so 

 long as they remain suspended in their liquor smiguims. 

 After the lapse 'of a few minutes, the fibrin, from its elasti- 

 city, contracts more and more, and a yellow fluid, called 

 serum, is pressed out, — or, in other words, the comjwnents 

 of the liquor sanguinis, with exception of the fibrin, — and 

 «)nly a shrunken, jelly-like mass remains. 



The blood-corpuscles of the lower animals Mr, Gulliver 

 has especially studied. In the blood-corpuscles of birds, 



