File:The physiology and hygiene of the house in which we live (1887) (14779310424).jpg

Identifier: physiologyhygien00hatf (find matches)
Title: The physiology and hygiene of the house in which we live
Year: 1887 (1880s)
Authors: Hatfield, Marcus P. (Marcus Patten), 1849-1909
Subjects: Physiology Hygiene
Publisher: New York : Chautauqua Press
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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Sympathetic ganglion cell fromKlein. man.— 188 Physiology and Hygiene. But we have no right to despise those animals which haveonly nerve-knots for brains ; for to tell the truth we are allmade after the same plan. There was a time when all thiswonderful nervous system of ours consisted of only twowhite cords wrapped in a bit of cartilage. After a littlethere appeared on these little cords five tiny swellings, look-ing like beads on a string, and if you should look into the
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Cross-section of the skull and brain, made just behind the ears, showing the ven-tricles, corpus callosum, cerebrum, and the longitudinal and transverse sinuses —Rosers Vademccum. brains of all the higher animals yov, would find the same five swellings, somewhat enlarged, to be sure, and now we call them ganglia; but these same five ganglia can be detected in almost every cranium. In the lowest fishes they lie open, like eggs in the nest of a bird, but in our brains they are sheltered beneath an arch which we call the hemisphere of the brain. (See cut above, which also shows that the larger Telegraphs and Phones. 189 brain, like the rest of us, is made of two halves, so joinedtogether by a strung band that they form a sort of flattenedsphere, rough outside and smooth inside.) The heads into which I have had the privilege of lookingI have found well packed with a grayish pulp which goes un-der the name of brains. You have all heard this comparedto blanc-mange, but to me it always loo

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