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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1869. Excerpt: ... Embryology of Hemiptera.--M. Mecznikow has published, also in the 'Zeitschrift, ' a paper on the Embryology of Hemiptera. Auditory Organ of Locusia.--M. Hensen has published, also in the ' Zeitschrift, ' a memoir on'the auditory organ of Locusta, in which he confirms the description given by Von Siebold. He also endeavours to prove that there is an identity of plan between this organ and the ear of Crustacea, comparing the auditory rods of the former with the hairs of the latter. lie admits that the rods have at their apex a large cell, of which the hairs show no trace; but he argues that the rods of Locusta are primary structures, while the auditory hairs of Crustacea have never been examined until after several changes of skin; and he thinks that if the auditory hairs were examined before the first moult, corresponding cells might probably be found at their apex. In any case he does uot think that the mere presence of these cells is sufficient to destroy the analogy. He concludes therefore that these auditory rods, like the auditory hairs of Crustacea, are thrown into vibration, when they are fitted, by their form and elasticity, to vibrate in a period corresponding to the exciting sound. Development of Simulia, Miaster, Corixa and Aphis.--M. E. Mecznikow, also in the 'Zeitschrift, ' describes the development of these four genera. Colour of Insects dependent on external condition.--Dr. Moller has published a memoir on the influence exercised upon insects by external conditions. One of the most interesting parts is that in which he gives cases where the colour of a species depends on that of its habitat. Thus, for instance, Elaphrus riparius, he says, in sandy districts, is of a clear brown colour; in meadow lands, on the contrary, green. Again, the larva o...
| ISBN-13 | 9781154191608 |
|---|---|
| ISBN-10 | 1154191605 |
| Weight | 0.80 Pounds |
| Dimensions | 9.00 x 6.00 x 0.55 In |
| List Price | $22.16 |
| Format | Paperback |
|---|---|
| Pages | 242 pages |
| Publisher | |
| Published On | 2010-03-01 |
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