File:Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct - for the use of schools and colleges (1870) (14596076840).jpg

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Identifier: outlinesofcompar00agas (find matches)
Title: Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges
Year: 1870 (1870s)
Authors: Agassiz, Louis, 1807-1873 Gould, Augustus A. (Augustus Addison), 1805-1866 Wright, Thomas, 1809-1884
Subjects: Physiology, Comparative Zoology
Publisher: London : Bell & Daldy
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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6. Capsus tricolor. 7. Bostrichus capucinus. 8. Staphylinus maxillosus. 9. Prionus coriarius.10. Sih)ha obscura * There are few divisions of comparative anatomy so much calcu-lated to set in a clear light the importance of this science in connexionwith the study of general morphology, as the sketch just given of thevast variety of form presented hy the glandular system. If we would giveplans or ideal outlines of the principal forms of the different elements of STETTCTrEE OF GLAXDS. 253 animal kingdom (§ 370) probably required the singular un-folding of the glandular elements which we observe among its B
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Fig. 254.—The glands of insects which secrete the acrid or corrodingjuice, after Leon Dufour, An. d. Sc. Nat. T. vii. pi. 19 and 20. A, ofChlaenius velutinus. B, of Brachinus crepitans. C, of Calathus fulvipes. the glandular system in man and the more perfect animals, no bettermethod could be followed than to pursue a single gland through the classof insects. As supplementary to this part of our subject, the elegantforms which the clustered canals and vesicles of others of the specialsecreting organs of insects exhibit may be referred to in the subjoinedfigures. 254 STKTJCTUKE OF GLANDS. members. The blind extremities of the glands are surroundedimmediately by the blood, which is poured freely into all theinterstices of the body, and so attract the substances from itsmass which the glands of other and higher animals havebrought to them by finely divided capillary reticulations, to besubjected to their peculiar elective attractions. (§ 420*. It is infinitely more difficult to form a

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