BLOOD, 319 



Lecanui quotes an opinion of Delarive, tliat a change occurs 

 in the colouring matter of the blood that escapes in lisematuria, 

 since sulphuric acid produces a brown-red instead of a black-red, 

 and nitric and muriatic acids produce a white instead of a black- 

 red precipitate : alcohol also produces a white deposit. These 

 peculiarities in colour (especially the white precipitate) may pro- 

 bably be explained by the precipitation of the albumen^ while in 

 consequence of the dilution of the blood the hsematoglobulin 

 escapes precipitation. 



Purpura htsmorrhagica. 



[The blood has been analysed in a case of this disease by 

 Routier2. In 1000 parts he found : 



Water .... 795-244 



Solid constituents 

 Fibrin 



Blood-corpuscles 

 Residue of serum 



204-756 



0-905 



121-701 



83-405 



From this analysis it appears that the blood does not assume 

 the form of spanoemia. It is placed here in consequence of the 

 analogy between purpui'a hemorrhagica and the preceding 

 diseases.] 



Typhus petechialis putridus. Yellow fever. Plague. 



The blood in these diseases is described as watery, very poor 

 in fibrin, and of a dark colour. If any clot be formed, it is 

 diffluent, and very soft : the serum is frequently of a deep yellow 

 or brown-red colour, partly from the colouring matter of the 

 bile, and partly from dissolved h?ematoglobulin. It possesses 

 a very peculiar smell, which probably differs in each disease. It 

 is by no means improbable that this smell may be produced by 

 a volatile salt of ammonia. 



Schonlein has directed attention to the formation of a pecu- 

 liar gas that escapes with the blood in the post-mortem exami- 

 nation, on opening the large vascular trunks, and which is pro- 

 bably developed in the blood during the last stage of the disease. 



Chomel also speaks of the development of a gas in the in- 

 terior of the veins. 



' Etudes chimiques, etc., p. 95. 



^ Gazette des Hopitaux, vol. 6, No. 90. 



