40 Professor Halfm^d. 



Septembers, 1875. At 11.50 a.m., I threw in at 

 one injection into the left jugular vein of a full sized 

 sheep-dog, one ounce of the saturated solution of 

 S0 2 . 



Result. The dog, on being .placed on his legs, 

 staggered a little, but soon became quiet and lay 

 down. A quarter of an hour after this he got up, and 

 became as lively as before the experiments. 



October 12, 1875. Half an ounce of sulphurous acid 

 of the recognised strength was thrown into the femoral 

 vein of a small dog. 



Result. Before the whole quantity was injected, 

 the dog suffered as if from choking, and the breathing 

 was much oppressed. Shortly "afterwards, he quite 

 recovered. In order to ascertain whether the acid had 

 been oxidised in the pulmonary circulation, or had 

 travelled on to the tissues, the following observations 

 were made : 



Four test-tubes were taken and marked Nos. 1, 2, 

 3,4. 



Into No. 1, blood was taken from the ear before the 

 acid was injected. 



Into No. 2, blood was placed three minutes after the 

 injection. 



Into No. 3, blood was placed ten minutes after 

 injecting. 



Into No. 4, blood again twenty minutes after 

 injecting. 



In each test-tube was added a fragment of zinc, and 

 then a little hydrochloric acid, at the same time a cap 

 of paper, moistened with acetate of lead, was placed 

 over the mouth of the test-tube. The result would be, 

 if sulphites were present in the blood, a blackish 

 sulphide of lead would be formed on each paper cap. 



