60 I'rofessor Hering on the Circulation of the Mood. 



cient to discover the foreign principle at their free surface ; and, 

 soon after, it is found at their other surface (Exp. 2, 6, 7, 15, 

 16.) The mucous membrane of the right half of the stomach 

 secretes more promptly than that of the intestine, and the latter 

 more quickly than the surface of the lungs (Exp. 6, 15, 16, 

 17.) Secretion is much slower at the genito-urinary surface ; 

 what was found of the solution in the urinary passages came 

 only from the kidneys. 



The mucous surfaces covered with an epithelium (as the walls 

 of the mouth, the pharynx, the left half of the stomach, in the 

 horse) gave no traces of secretion of the saline solution in- 

 jected. 



4ith, The liver, the spleen, the thyroid gland, &c. allow the 

 presence of the hydrocyanate to be detected only with difficulty, 

 on account of their dark colour. The salivary glands appeared 

 to perform a considerable part in the elimination of the foreign 

 substance (Exp. 5, 6, 7, 16, 18.) 



5th, The kidneys act also very powerfully. The re-agent 

 manifests the presence of the hydrocyanate in the interval of one 

 minute (Exp. 9.) in the cortical and tubular parts, and in the 

 pelvis. The passage of the urine through the ureters being ra- 

 ther slow, the consequence is, that the bladder does not present 

 traces of the foreign precipitate until after a pretty long inter- 

 val. The small bloodvessels of the kidneys gave signs of re- 

 action, while the large ones gave none ; whence it might be con- 

 cluded, either that the circulation is slower in the former, or 

 that the hydrocyanate already commences beforehand to sepa- 

 rate from the blood. 



6th, In the lungs this salt is not so difficultly discovered as 

 might have been presumed. 



Ith, The saline solution adheres in some cases to the walls of 

 the bloodvessels, and is then easily discovered by the re-agents 

 (Exp. 15, 18.) ; more frequently it does not adhere to them 

 (Exp. 5, 16, 17.) Sometimes it adheres in some of them and 

 not in others (Exp. 6.) The cause of this difference is un- 

 known. 



8^^, The shortest time which the solution takes to reach the 

 thoracic duct is still undetermined. A minute sufficed in one 

 case (Exp. 9.), and from tw6 to five minutes in others (Exp. 



