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Scientific Intelligence* — Chemistry. 149 



exhalation of the animal from which the blood was taken. III. In 

 the blood this volatile principle is in a state of combination, its odor 

 being then insensible. IV. When the combination is broken, this 



f principle is volatilized, when it is easy to recognize the animal to 



which it belongs. V- In each species of animal, this principle is 

 more decided, or has more intensity of odor in die male than in die 

 female ; and in men, the color of the hair accompanies tertain varia- 



t tions in this principle. VL This principle is in a solnble state in the 



blood, and may be found, therefore, eitlier in the unaltered blood, or 

 after the fibrine has been removed, or even in tlie scrosity of blood- 

 VIL Of all the means of setting this principle at liberty, concentrated 

 sulphuric acid has succeeded best- 

 To obtain these results, it is only necessary to put a few^ drops of 

 blood, or the serosity of blood, into a glass, to add concentrated svd- 

 phuric acid, to the amount of one third or half as much as of blood, 

 and to stir the whole together with a tube : die odoriferous principle 

 is immediately rendered evident. By these means, M. Barruel can 

 readily distinguish the blood from the following sources. 



1. That of a man disengages a strong odor of the perspiration of 

 man, which it is impossible to confound with any oUier. II. That 

 of a W'Oman by a similar odor, much weaker, and resembling the 

 perspiration of women. III. That of the ox, a strong odor of oxen 

 or a cow-house, or of cow^-dung. IV. That of tlie horse, by a strong 

 odor of the perspiration of tlie horse or of horse-dung. V. That of 

 a ewe, by a strong odor of wool, impregnated widi the perspiration 

 of that animal. VL That of a wether, by an odor analogous to that 

 of sheep, mixed with a strong odor of the goat. VII. That of the 

 dog, the odor of the transpiration of a dog. VIII. That of a pig, by 



the disagreeable odor of a piggery. IX. That of a rat, by the bad 



odor belonging to the rat. 



The same result has been obtained with the blood of various kinds 

 of birds ; and even with the blood of a frog, which gave the strong 

 odor of marshy reeds, kc. j and with that of a carp, which gave a 

 principal smelHng like the mucus which covers the bodies of fresh 

 water fish. 



^ Upon trials made to ascertain whether spots of blood could be dis- 

 tinguished, and referred to tlieir source, M. Barruel found, that to a 

 certain extent, a pretty sure judgment could be given, even after 

 fifteen days or more. The spotted linen is to be cut out, put into a 

 watch glass, and being moistened with a little water, is to be left Tot 



