File:The pedigree of man - and other essays (1903) (14784609743).jpg

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Identifier: pedigreeofmanoth00haec (find matches)
Title: The pedigree of man : and other essays
Year: 1903 (1900s)
Authors: Haeckel, Ernst Heinrich Philipp August, 1834-1919
Subjects: Man Evolution Man Evolution
Publisher: London : A and H.B. Bonner
Contributing Library: ASC - York University Libraries
Digitizing Sponsor: York University - University of Toronto Libraries

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Fig. 13. A bract or shield-bearer (h) of a hydra-colony (Stephanoinia.)A nutritive polyp (b) and several tactile polyps (h) are pro-tected by it. simply of a cartilaginous jelly-like mass traversed by anutritive canal. Beneath their umbrellas we find hid-den a number of pear-shaped bodies, with a mouthopening, that seizes food greedily, and with digestivecells of a hepatic nature. It can attach itself firmly bysuction by means of its octagonal oral margin (Fig.14 /), which is capable of extraordinary expansion.These have, as feeding polyps, the duty of taking in THE DIVISION OF LABOR. 113
Text Appearing After Image:
Fig. 14. A nutritive polyp and tentacles of a hydra colony (Anthe-modes.) a. Point of attachment of the polyp to the stem ;h. Body-wall of the polyp ; c. Its gastric cavity ; d. Hepaticcells, e. Proboscis. /. Month aperture extended into theform of an octagonal disk, and attached by suction, g. Wallof the tentacle, h. Its cavity, i. Secondary tentacles. 1c.Bell-shaped investment of the thread-cell battery. I. m.Terminal thread of the latter. I 114 THE DIVISION OF LABOR. and digesting food for the whole colony. A very long,,exceedingly mobile tentacle (Fig. 14 h) is attachedclose by the base of each nutritive polyp. This is be-set with many finer tentacles of a secondary ordereach of which bears a battery of thread-cells, of verycomplex structure. The thread-cells, of which eachbattery contains several hundreds, are delicate micro-scopic poison darts, beset with hooks, and connectedwith a poison vesicle. They produce a burning sen-sation in the human skin like that due to stinging-nett

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Flickr tags
InfoField
  • bookid:pedigreeofmanoth00haec
  • bookyear:1903
  • bookdecade:1900
  • bookcentury:1900
  • bookauthor:Haeckel__Ernst_Heinrich_Philipp_August__1834_1919
  • booksubject:Man
  • booksubject:Evolution
  • bookpublisher:London___A_and_H_B__Bonner
  • bookcontributor:ASC___York_University_Libraries
  • booksponsor:York_University___University_of_Toronto_Libraries
  • bookleafnumber:130
  • bookcollection:YorkUniversity
  • bookcollection:ontario_council_university_libraries
  • bookcollection:toronto
Flickr posted date
InfoField
28 July 2014


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28 September 2015

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01:15, 28 September 2015Thumbnail for version as of 01:15, 28 September 20151,268 × 2,832 (380 KB)Fæ (talk | contribs)== {{int:filedesc}} == {{information |description={{en|1=<br> '''Identifier''': pedigreeofmanoth00haec ([https://commons.wikimedia.org/w/index.php?title=Special%3ASearch&profile=default&fulltext=Search&search=insource%3A%2Fpedigreeofmanoth00haec%2F fin...

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