. Insects, their ways and means of living. Insects. INSECTS. Gng-V- - Gng-VTI Gng-vm ,-Proc ~vm tx x Fig. 72. The general nervous system of a grass- hopper, as seen from above Ant, antenna; Ao, aorta; fir, brain; Or, cercus; E, compound eye; Gng/, ganglion of prothorax; Gng2, ganglion of mesothorax; Gngj+I+Il+III, compound ganglion of metathorax, comprising the ganglia belonging to the metathorax and the first three abdominal segments; GnglV—GngVIH, ganglia of the fourth to eighth abdominal seg- ments; 0, ocelli; Proc, proctodeum, or posterior part of alimentary canal; Sa, suranal plate; Stgll
. Insects, their ways and means of living. Insects. INSECTS. Gng-V- - Gng-VTI Gng-vm ,-Proc ~vm tx x Fig. 72. The general nervous system of a grass- hopper, as seen from above Ant, antenna; Ao, aorta; fir, brain; Or, cercus; E, compound eye; Gng/, ganglion of prothorax; Gng2, ganglion of mesothorax; Gngj+I+Il+III, compound ganglion of metathorax, comprising the ganglia belonging to the metathorax and the first three abdominal segments; GnglV—GngVIH, ganglia of the fourth to eighth abdominal seg- ments; 0, ocelli; Proc, proctodeum, or posterior part of alimentary canal; Sa, suranal plate; Stgll—X, second to tenth segments of abdomen; SoeGng, suboesophageal ganglion; Stom, stomo- deum, or anterior part of alimentary canal stimulus, most like- ly, comes from the products of physio- logical changes be- ginning to take place in the body that will soon result in the transformation of the caterpillar into a chrysalis, a stage when the insect needs the protection of a cocoon. These activities of insects we call instincts, but the term is simply a cover for our ignor- ance of the processes that cause them. External stimuli are things of the outer environment that affect the living organism. They in- clude matter, elec- tromagnetic energy, and gravity; but the known stimuli do not comprise all the activities of matter or of the "; The common stimuli are: pressure of solids, liquids, and gases; humidity; chemical qualities (odors and tastes); I 120. 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 Snodgrass, R. E. (Robert E. ), 1875-1962. New York Smithsonian Institution series
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Keywords: ., bookauthorsnodgrassrerobert, bookcentury1900, booksubjectinsects
