. The American entomologist and botanist. swer for many ob-jects if clear; and even mica, which separatesreadily into thin plates, and can be readily cutwith scissors, serves a very useful purpose, al-though liable to injury from scratches. Thecovers need not be round; square or oblong onesare just as good. Cut on an average one-halfinch square; few will be required larger, and themajority of specimens will be covered by a one-quarter inch cover. Having a supply of theseready for use, obtain a vial of fir or Canadabalsam, thin it with chloroform aud keep tightlycorked. Whenever a small insect,
. The American entomologist and botanist. swer for many ob-jects if clear; and even mica, which separatesreadily into thin plates, and can be readily cutwith scissors, serves a very useful purpose, al-though liable to injury from scratches. Thecovers need not be round; square or oblong onesare just as good. Cut on an average one-halfinch square; few will be required larger, and themajority of specimens will be covered by a one-quarter inch cover. Having a supply of theseready for use, obtain a vial of fir or Canadabalsam, thin it with chloroform aud keep tightlycorked. Whenever a small insect, a mite, agnat, or a young larva, just from the egg, is tobe preserved, place it upon the centre of a cleanglass slide, let a drop of the balsam fall upon it,and apply the cover. A little experience willenable one to avoid air-bubbles and suchinconveniences, and show how long the prepar-ation requires to dry and harden, as well as whatweight to apply to the cover. English opera-tors use a very eflective and simple contrivance [Fig. 1S3.]. of wire as in Figure 183, and easily made ofdifierent powers of compression suitable to the object. The specimens thus prepared should be kept in boxes lined with grooved slips of wood as in Figure 184, having the grooves op- [Fig. :s4j
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Keywords: ., bookcen, bookdecade1870, booksubjectbotany, booksubjectentomology
