The pedigree of man - and other essays (1903) (14578102098)

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



Text Appearing Before Image:
ION OF LABOR. 101 of Brazil, where the robber ants and the Sahubae leadtheir checkered lives, to the cool shore of our northernGerman coasts, when a fresh north wind has thrownup on the sandy strand a number of so-called sea-nettles or jelly-fish (the Medusas of the zoologists).Whoever has walked with eyes open on the shore of theBaltic or of the North Sea, is acquainted assuredly withthese jelly-like animals that are often cast up by thethousand from the waves. When we see them lyingthere in heaps, a slimy, shapeless mass of jelly, we canform no clear idea as to the wondrous beauty that theseMedusas swimming in the sea, exhibit. But if they areplaced with some of the water in which they swim ina large glass vessel, we are filled with wonder at thegrace of their swift movements, the delicacy of theirshimmering hues, the elegance of their flower-like form(Fig- 1). The commonest of our large North-German Medusaeis called Aurelia aurita. Fig. 2 in vertical section,Fig. 3 seen from below.
Text Appearing After Image:
An eared jelly-fish (Aurelia aurita), from the Baltic, in ver-tical section, a. Gelatinous umbrella; o. Mouth; o. Twoof the four oral tentacles, beset with sexual buds ; o. Sectionthrough their bases (the pillars of the mouth) ; g. Ovary ; Stomach; h. Branching vessels running from the sto-mach to the margin of the umbrella ; this last beset withmany delicate tentacles. The gelatinous, transparent body of this Aurelia hason the whole the shape of a shallow glass bell. In themiddle of its under surface is the mouth (Fig. 2 o), sur-rounded by four long, very mobile tentacles (Fig. 2 o, 102 THE DIVISION OF LABOR. Fig. 3 b.) From the circumference of the bell-shapeddisk or umbrella hang many very fine tentacles (Fig.3 t) Further, eight sensory vesicles (Fig. 3 a) areplaced at regular intervals within the margin, andprobably function as both eyes and ears. The moutho, leads into a stomach (Fig. 2 k, Fig. 3 v), whencemany radiating, branching, digestive canals (Fig. 2 k, .Fig. 3 gv) run to