268 PHYSIOLOGY AT THE FARM. 



foetus. According to Branconnot and Wohler, the urine of 

 calves, as long as they are sucking or are fed on milk, is almost 

 colourless, clear, devoid of colour, of very little taste, and with 

 a strong acid reaction, which it does not lose even on evapor- 

 ation. Allan toine is the principal organic constituent of this 

 urine. " It contains urea and likewise uric acid in the same 

 proportions as they occur in normal human urine ; hippuric 

 acid, on the other hand, cannot be discovered in it. It con- 

 tains a very considerable amount of phosphate of magnesia 

 and of the potash salts, but only very small quantities of the 

 phosphates, sulphates, and soda salts/' The solid constituents 

 altogether amount to no more than 0.62 per cent. The allan- 

 toic fluid of the foetal calf appears to have precisely the same 

 properties and the same composition as the urine of the calf 

 while still living on milk.* 



In the urine of sheep no peculiarity has been remarked dif- 

 ferent from its character in oxen. 



The urine of the pig is of a pale yellow, clear and trans- 

 parent. It contains urea, the sulphates of potash and of 

 soda, the chlorides of potassium, of sodium, and ammonium, 

 and traces of the carbonate of lime and the sulphate of lime. 



The urine of the dog takes its character from that of the 

 carnivorous group of animals to which it belongs. 



The following table affords the type of the urine in car- 

 nivorous animals : 



Urea and free lactic acid, . . . . 13.220 



Uric acid, . . . . . . 0.022 



Mucus, ...... 0.510 



Sulphate of potash, . . . . 0.122 



Chloride of ammonium and trace of chloride of sodium, 0.116 



Carry forward, . . . . 13.990 



* Lehmann, 'Physiological Chemistry,' translated by Day, vol. ii. pp. 

 456, 457. 



