326 Veterinary Medicine. 



Pleuritic effusion. This varies greatly at the different stages 

 of the disease. As effused it has a composition resembling that 

 of the blood : — 



Water, 911 to 924 



Albumen, 63.33 to 82.50 



Fibrine formers, 2.16 to 12.50 



Extractive matter. 

 Salts. 

 The progressive changes from the hsemorrhagic effusion to the 

 limpid hydrothorax and their relation to the different stages of the 

 disease and the subsidence of the inflammation are of thejgreatest 

 importance in deciding questions of responsibility, when the 

 animal has recently changed hands. St. Cyr has classified his 

 cases in the following instructive table : 



Up to the 7th day 50 per cent were dark red ; after the 7th day 

 only 13.3 per cent ; and after the 1 5th day none. Up to the 7th 

 day 83.3 per cent were either dark red or sero-sanguineous and 

 not one had attaine d to translucency. After the 7th day only 8 

 per cent were of port wine hue, and by the 15th day 24 per cent 

 of all cases of over seven days standing were already transparent. 

 Of all cases of over 15 days standing, 80 per cent were perfectly 

 translucent and none showed the dark red hue. Finally, after the 

 30th day all remaining cases were limpid. This of course must 

 not be applied with the same confidence in both directions. While 

 translucency of the effusion bespeaks seven days' standing and 

 probably fifteen or twenty, the dark red hue must not be held to 

 imply a recent date for the attack. A relapse in the course of 

 convalescence may easily and quickly stain anew a liquid that 

 was already limpid, or had advanced far toward this condition. 



