156 



THE SECRETIONS: 



hours must, in adult individuals, be equal to that of these bases 

 and acids supplied to the organism, during the same period, 

 through the medium of aliments." 1 



Our knowledge respecting the influence of diet on the com- 

 position of the urine has been much increased by the admirable 

 researches of Lehmann, 2 instituted on himself. The whole of 

 the urine passed in twenty-four hours was always collected, the 

 absolute weight and specific gravity determined, as well as the 

 amount of solid residue. The investigation was commenced in 

 October, and the amount of drink was only just sufficient to allay 

 thirst. During thirteen successive days, on which he lived on 

 his ordinary mixed diet, the following observations were made : 



Solid residue 

 per mille. 



58-432 



Amount of urine 

 in 24 hours. 



1088 grammes 3 



Whole amount of 

 solid residue, in grammes. 



63-5718 

 59-2662 

 62-8895 

 68-2124 

 56-9052 

 78-4759 

 56-0862 

 62-4376 

 68-1824 

 75-9434 

 81-4702 

 73-9633 

 74-2777 



A perfect analysis of the urine was made on three of these 

 days, the results of which are recorded in p. 144. 



The amount of urea was determined on the 1st, 2d, 4th, 6th, 

 7th, 8th, llth, and 12th days. The results are given in the 

 following table : 



Solid residue 



in 1000 parts 



of urine. 



58-430 

 65-988 

 66-744 

 65-008 

 62-318 



927 

 1022 



712 

 1361 



900 



940 

 1100 



939 

 1448 

 1088 

 1328 



Spec. grav. 

 1017-4 

 1022-2 

 1025-1 

 1024-7 

 1029-2 

 1020-2 

 1019-2 

 1022-5 

 1019-1 

 1029-4 

 1016-7 

 1025-2 

 1015-6 



65-998 

 67-842 

 66-744 

 79-923 

 65-008 

 62-318 

 66-423 

 61-984 

 80-878 

 56-264 

 67-981 

 55-932 



66-423 

 56-264 

 67-981 



Urea 



in 1000 parts 

 of urine. 



26-72 

 32-91 

 28-22 

 29-25 

 31-45 

 29-50 

 23-72 

 32-91 



Urea 



in 100 parts 

 of solid residue. 



45-74 

 49-87 

 43-79 

 44-99 

 50-46 

 44-41 

 42-15 

 48-41 



Daily amount 



of urea, 

 in grammes. 



39-077 

 29-556 

 29-869 

 35-306 

 28-301 

 27-728 

 34-339 

 35-804 



1 Lancet, June 1844. 2 Journal fur praktische Chem*j, 1842-3. 



3 The gramme = 15 - 4 grains troy. 



