206 BLOOD. 



red colour. The thickness of this blood is the cause why it is less 

 readily infiltrated into the tissues than other blood. It is moreover 

 worthy of notice, that fibrinous coagula never occur simultaneously 

 with these clots in the heart and the larger vessels, for when they 

 are present, they are found in the vessels of moderate calibre, but 

 never in the capillaries. 



2. The blood in acute diseases of the spinal cord and of the 

 brain is found to be thickly fluid, of a dirty brownish red colour, 

 uncoagulated, and devoid of fibrinous coagula. 



3. A thick, uncoagulated, and not coagulable blue and blackish 

 red blood, which, under certain favourable conditions, sometimes 

 deposits fibrinous coagula in the heart and the larger vessels, is 

 certainly not characteristic of merely one form of admixture of 

 the blood ; for blood of this kind is found in the body after diseases 

 which reciprocally exclude one another, as, for instance, after 

 plethora (depending upon heart diseases), typhus, acute tuber- 

 culosis, cholera, and poisonings with narcotics and lead, and after 

 sudden and profuse sweats or diarrhoeas. 



4. A pale, or vermilion-red, uncoagulable, thin fluid blood, which, 

 notwithstanding its fluidity, does not readily infiltrate the tissues, 

 but which often deposits a considerable quantity of fibrinous coagula 

 in the larger vessels, does not belong to any special admixture of 

 the blood, since it is met with after the most varied conditions of 

 disease, when the blood has acquired a watery character ; as, for 

 instance, after frequent venesections, haemorrhages, considerable 

 exudations, long-continued diarrhoea and sweats ; and in the 

 anaemia following typhus and the acute exanthemata, as well as 

 in senile atrophy. 



5. A thin bluish black, uncoagulable blood, which is distributed 

 in large quantities from the great to the smallest vessels, which 

 easily infiltrates into the different tissues, and which never exhibits 

 any separation of fibrinous coagula, is found in valvular anomalies 

 of the heart. 



An accurate analysis of this variety of blood, compared with 

 the composition of the blood in the living body, during the 

 existence of the different conditions arising from mechanical 

 difficulty and obstruction of the function of respiration, as, for 

 instance, plethora, hsemorrhoidal affections, dropsy. &c., would 

 undoubtedly yield the most valuable aid towards the explanation 

 of the mechanical and chemical metamorphosis of matter in the 

 animal body. 



6. Finally, there is a kind of blood found in the body after death, 



