IN MAN AND ANIMALS. 65 



phate, carbonate, and hippurate of soda. Berzelius 

 found in 1,000 parts of fresh human fgeces only nine 

 parts of a substance similar to bile ; 5 ounces, there- 

 fore, would contain only 21 o-rains of dried bile, 

 equivalent to 210 grains of fresh bile. But a man se- 

 cretes daily from 9,640 to 11,520 grains of fluid bile, 

 that is, from 45 to 56 times as much as can be detect- 

 ed in the matters discharged by the intestinal canal. 



Whatever opinion we may entertain of the accu- 

 racy of the physiological experiments, in regard to 

 the quantity of bile secreted by the different classes 

 of animals ; thus much is certain, that even the max- 

 imum of the supposed secretion, in man and in the 

 horse, does not contain as much carbon as is given 

 out in respiration. With all the fat which is mixed 

 with it, or enters into its composition, dried bile 

 does not contain more than 69 per cent, of carbon. 

 Consequently, if a horse secretes 37 lbs. of bile, this 

 quantity will contain only 40 ounces of carbon. 

 But the horse expires daily nearly twice as much in 

 the form of carbonic acid. A precisely similar pro- 

 portion holds good in man. 



Along with the matter destined for the formation 

 or reproduction of organs, the circulation conveys 

 oxygen to all parts of the body. Now, into what- 

 ever combination the oxygen may enter in the 

 blood, it must be held as certain, that such of the 

 constituents of blood as are employed for reproduc- 

 tion, are not materially altered by it. In muscular 

 fibre we find fibrine, Avith all the properties it had 



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