. Elementary studies in insect life. Insects. AND FUNCTION 271 of small scissors open the specimen on the median line of the back, the full length of the body. Be careful not to cnt deeper than the body-wall, lest the internal organs be disturbed; pin down the sides of the body to the cork. The specimen is now ready for study npon the dissecting-stand. The specimen can be more readily manipulated if the block or cork of wood holding it be placed in a vessel containing just enough water to cover the speci- men. The internal organs will float out and stand up more FIG. 209. Di
. Elementary studies in insect life. Insects. AND FUNCTION 271 of small scissors open the specimen on the median line of the back, the full length of the body. Be careful not to cnt deeper than the body-wall, lest the internal organs be disturbed; pin down the sides of the body to the cork. The specimen is now ready for study npon the dissecting-stand. The specimen can be more readily manipulated if the block or cork of wood holding it be placed in a vessel containing just enough water to cover the speci- men. The internal organs will float out and stand up more FIG. 209. Digestive, circulatory and nervous systems of female grasshopper. 1, 2, 3, 4, 6, 6, 7, 8, 9, 10, 11, 12, segments; a-a, digestive tract; H, hypopharynx ; Lb, labium; Lm, labrurn ; Lp, labial palpus ; mp, maxillary palpus ; (J?, tesophagus ; pp, ovipositors ; eg, egg guide ; co, colon ; r, rectum. The heart is an open tube running along the back; it is so marked, but not easily shown. Enlarged three times. The digestive system begins with the masticatory organs of the mouth, previously shown. (Figs. 193, 195.) The food is here masticated and mingled with the saliva secreted by glands lying under the esopha- gus. From the esophagus it passes into the crop, where it is retained until mixed with the saliva. The food then enters the gizzard-like proventriculus; the inner walls of this are lined with chitinized processes, which, by a series of contractions, grind up the food. 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 Hunter, Samuel John, 1866-1946. Topeka, Kan. , Crane & company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsects, bookyear1902
