. The American entomologist. Entomology. 294 -fffiE AMERICAN HOW TO COLLECT AND STUDY INSECTS-No. 5. IIY P. G. SANDORN, BOSTON, MASS. "Wliilc speaking of the microscope and its uses in stndying lining insects, I should mention a method of preparing specimens and fragments ilkistratiug the structure or anatomy of tliesc minute beings, so that they may be preseiTed indefinitely for future use. The ordinary size of a "slide" for the microscope is, as I previ- ously said, three inches in length by one in breadth. The slide should be cut from clear and rather thin glass, free from il
. The American entomologist. Entomology. 294 -fffiE AMERICAN HOW TO COLLECT AND STUDY INSECTS-No. 5. IIY P. G. SANDORN, BOSTON, MASS. "Wliilc speaking of the microscope and its uses in stndying lining insects, I should mention a method of preparing specimens and fragments ilkistratiug the structure or anatomy of tliesc minute beings, so that they may be preseiTed indefinitely for future use. The ordinary size of a "slide" for the microscope is, as I previ- ously said, three inches in length by one in breadth. The slide should be cut from clear and rather thin glass, free from ilaws and air-bubbles, and a few dozen should be kept constantly on hand; they can be easily and cheaply got out by any glazier from his waste slips. If the student wishes to have them finely finished, he can grind the edges smooth upon an emerj' wheel, a com- mon grindstone, or even upon a flat surface with emery powder and water, at the expense of a little more time and labor. The " covers " will cost him rather more care, as the exceetlingly thin glass which is prepared for this purpose is not to be procured except in large cities, where an ounce of circular covers of various sizes gen- erally costs about three dollars. The thinnest glass he can procure will answer for many ob- jects if clear; and even mica, which separates readily into thin plates, and can be readily cut with scissors, serves a very useful purpose, al- though liable to injury from scratches. The covers need not be round; square or oblong ones are just as good. Cut on an average one-half inch square; few will be required larger, and tlie majority of specimens will be covered by a one- quarter inch cover. Having a supply of these ready for use, obtain a vial of fir or "Canada" balsam, thin it with chloroform and keep tightly corked. "Whenever a small insect, a mite, a gnat, or a young larva, just from the egg, is to be presei-ved, place it upon the centre of a clean glass slide, let a d
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