. Injurious and useful insects; an introduction to the study of economic entomology. Insects; Beneficial insects; Insect pests. i6 INJURIOUS AND USEFUL INSECTS muscles and heart will have been removed with it, unless special pains have been taken to leave them behind. Observe the segmentally arranged muscles and the heart, which looks like a transparent streak running along the middle line. To examine the de- tails of the heart, it is best to harden it with chromic acid or some other fixing agent, and alcohol. It must then be carefully separated from the cuticle, stained and mounted in balsam.
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. Injurious and useful insects; an introduction to the study of economic entomology. Insects; Beneficial insects; Insect pests. i6 INJURIOUS AND USEFUL INSECTS muscles and heart will have been removed with it, unless special pains have been taken to leave them behind. Observe the segmentally arranged muscles and the heart, which looks like a transparent streak running along the middle line. To examine the de- tails of the heart, it is best to harden it with chromic acid or some other fixing agent, and alcohol. It must then be carefully separated from the cuticle, stained and mounted in balsam. Beginners are not ad- vised to attempt this. Pin the insect down in a dissecting dish, and add water until it is just covered. The pins must not stand up ver- tically, lest they should get in the way of the dissecting instruments, but should be inserted nearly horizontally. Free the turns of the alimentary canal, and lay it out on one side of the dissection (out- side the body), but without cutting it through at any point. Notice the compon- ent parts of the ali- mentary canal. These are, in order from before backwards: (i) The oesophagus or gullet, which issues from the head, and soon dilates into (2) the crop, a large pear-shaped, thin-walled sac, widest behind; (3) the gizzard or proventriculus, a firm and thick-. Fig. 15.—Alimentarycanal of cockroach. X z.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Miall, Louis Compton, 1842-. London, G. Bell & sons