n human blood and dog’s blood, the micro- study of these delicate creatures in even the most tric lighting for the use of naturalists, chemists, micro- graphers, etc., constructed by Mr. G. Trouve, Mr. De minute details. With the aid of the magnifying glass scope enables the expert to determine… … Fig. 4—THE TROUVE BATTERY. be made. It will be of great assistance in the dark days at Roscoff and Ban- impossible to determine between human blood and a yuls, when the want of light would -interrupt work hog’s blood. which had been commenced. This light does not change thecolor of the animals,…
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