36 



EFFECTS OF A COMPLETE DEPRIVATION OF AIR. 



In all cases, the blood examined after death was of a blackish-red color, and 

 much darker than that of Reptiles in its normal condition. It coagulated when 

 abstracted. 



The blood-corpuscles had undergone important modifications. Many of them 

 were shrunken, contorted and contracted; others were swollen, assuming the forms 

 of spheroids, and cubes, and irregular ovoids. The nuclei, which were rendered 

 distinct by the action of acetic acid, in many cases presented corresponding changes. 

 Many of the colorless corpuscles appeared altered in shape. 



A stream of oxygen gas, passed through the blood, did not change its color, 

 neither were the forms of the blood-corpuscles altered. 



In everj' instance the urine of these terrapins contained grape sugar. 



Figure 7 represents the blood-corpuscles of these terrapins, after they had been 

 deprived of air by a ligature around their windpipes. 



Fig. 7. 



Blood-corpuscles of salt-water Terrapins [Emtjs terrapin) and fresh-water Terrapins [Emys serrata), which had been 



deprived of air by ligatures around their necks. 



We will next consider the fibrin and fixed saline constituents of the blood of 

 animals, in its normal condition. 



