File:Image from page 204 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900) (14782671414).jpg
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[edit]DescriptionImage from page 204 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900) (14782671414).jpg |
Identifier: introductiontozo00dave Title: Introduction to zoology; a guide to the study of animals, for the use of secondary schools; Year: 1900 (1900s) Authors: Davenport, Charles Benedict, 1866-1944 Davenport, Gertrude Anna Crotty, 1866- Subjects: Zoology Publisher: New York, Macmillan company London, Macmillian and co., ltd. Contributing Library: MBLWHOI Library Digitizing Sponsor: MBLWHOI Library
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Text Appearing After Image: FIG. 172. — A bed of Modiola, the horse-mussel, ou a mud-bank. Photo, by W. H. C. P. The Aviculidael are a group closely allied to the last, butnot represented, on our shores. It is important becausemollusks of this family produce the best pearls. Pearl-lishing has been carried on since the earliest preservedhistoric records. The pearl banks of Ceylon are known 1 A small bird (acts). 186 ZOOLOGY to have been fished for two thousand years. The finestpearls come from the Persian Gulf. They are gatheredthere by native divers, who, after taking several deepinspirations, either dive down unaided or descend uponweighted ropes. When they can no longer remain underwater, they either ascend again unaided or are rapidlydrawn up to the boats above. The pearl oysters broughtup to the surface are then examined for pearls. The pearlis the secretion of the oyster about a small foreign body, such as a grain of sand.This secretion prevents theirritant from injuring thetissues. It is of the samenatur
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Date | circa |
Source | Image from page 204 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900) |
Author | Internet Archive Book Images |
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