350 THE SECRETIONS: 



The ash consisted of: 



Carbonate of magnesia with a little carbonate of lime 7'3 



Sulphate of soda .... 25'0 



Chloride of sodium . . . 14*7 



Carbonate of soda with a little carbonate of potash 53-0 



100-0 



Here we remark, as in the urine of oxen, a considerable excess 

 of the alkaline carbonates over the alkaline earths. The hip- 

 puric acid seemed very variable, sometimes equalling the urea 

 in amount.] 



Vauquelin analysed the urine of the beaver. He found in 

 it the bicarbonates of lime and magnesia, and hippurate of 

 soda, but no phosphates or uric acid. He also detected the un- 

 decomposed colouring matter of the bark of the willow (the 

 ordinary food of the beaver) in the urine ; for he found that a 

 piece of cloth which had been previously saturated with alum, 

 took up the same colour from soaking in the urine as from lying 

 in a decoction of the aforesaid bark. 



The urine of rabbits and guinea-pigs is much the same : it 

 has an alkaline reaction, froths on the addition of an acid, and, 

 when exposed to the air, throws down a sediment of carbonate 

 of lime : it contains urea and the salts which are generally met 

 with in the urine of the herbivora. 



[The urine of the hare has been examined on two occasions 

 by Von Bibra. The first analysis was made in December. By 

 external pressure on the region of the bladder he was enabled 

 to collect about three pints from seven or eight hares. This 

 was divided into two portions, one of which was evaporated and 

 incinerated, the other tested for hippuric acid, which was found 

 to be present in small quantity, forming 0'007 of the urine. 



The ash contained : 



Chloride of sodium with a little chloride of potassium 7' 12 



Sulphate of soda .... 16-82 



Carbonate of soda . . . 9-84 



Phosphate of soda . . . 53-05 



Phosphates of lime and magnesia . . 13-17 



100-00 



