On The Circulation in the Wings of Blatta Orientalis and Other Insects, and on a New Method of Tnjecting the Vessels of Insects

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Abstract
Whilst working in the laboratory of Prof. Ludwig, at Leipzig, this spring, I obtained a number of specimens of JB. orientalis, to look for nerve-endings in their salivary glands. I happened to examine their wings under the microscope, and finding a remarkably perfect circulation in them, was led to examine the wings of other insects, and study the subject somewhat closely. Several observers who have written on the circulation of insects have given lists of the insects in which they have observed the phenomenon.

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