150 ON THE NATURE AND PRINCIPLES of 



right; the weight of the latter being 73 grains, 

 that of the former 82 grains. The left ureter 

 presented nothing extraordinary in its appearance, 

 being neither distended nor discoloured. The 

 bladder contained six drachms of urine, which re- 

 mained quite clear after the application of nitric 

 acid and heat. 



EXP. 2. A precisely similar operation was per- 

 formed on a rabbit of the same size, and the animal 

 killed at the end of two hours and a half. The right 

 kidney weighed 80 grains; and the left, the one 

 exposed and handled, 84 grains ; being an increase 

 of only four grains. The bladder contained five 

 drachms of opaque urine, which became quite clear 

 on the addition of nitric acid. 



The first law which I shall seek to establish on 

 experimental evidence is the following ; viz. That 

 an obstruction to the return of blood through the 

 renal vein will cause the presence of either liquid 

 albumen, coagulating lymph, or blood in the urine 

 secreted by a kidney otherwise healthy. 



For this purpose I subjoin, in a tabular form, the 

 results obtained in a number of experiments ; a de- 

 tailed account of all of which, with the exception of 

 the two last, is contained in the 26th volume of the 

 Medico-Chirurgical Transactions. 



