. Injurious insects : how to recognize and control them . Insect pests; Insect pests. THE DKlIiSTlVE HYSTEM 13 end of the heart toward the liead opens into th(^ body cavity. When tlie heart contracts, the Ijiood it contains is f(jrced forward, and when it expands, more blood is admitted througli the side valves. The Digestive System There is a, fair'ly (^lose parallel between the digestive system of in- sects and that of some higher animals. The various organs concerned. Fio. 12, — Digestive system of an insect. (Diagrannnatic.) Original. are much modified in many species, according to their f
. Injurious insects : how to recognize and control them . Insect pests; Insect pests. THE DKlIiSTlVE HYSTEM 13 end of the heart toward the liead opens into th(^ body cavity. When tlie heart contracts, the Ijiood it contains is f(jrced forward, and when it expands, more blood is admitted througli the side valves. The Digestive System There is a, fair'ly (^lose parallel between the digestive system of in- sects and that of some higher animals. The various organs concerned. Fio. 12, — Digestive system of an insect. (Diagrannnatic.) Original. are much modified in many species, according to their food habits; but taking a typical group, we find the following parts : From the mouth the food passes through a and is con- veyed by a gullet or esophagus to a crop, which serves as a storage place. Thence it enters the gizzard, where it is ground up, and so passes on into the stomach, where part of the digestion and alisorp-. 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 O'Kane, Walter Collins, b. 1877. New York : The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsectp, bookyear1912
