By Jacques Loeb
Excerpt from The Mechanistic belief of existence: organic Essays
The essays contained during this quantity have been written on range ent events quite often according to requests for a favored presentation of the result of the author's investigations. The name of the amount characterizes their normal tendency as an try and learn lifestyles from a in basic terms physico-chemical view element. due to the fact that they deal to a wide quantity with the private paintings of the writer, repetition used to be unavoidable, yet in View of the technical problems provided through the various subject matters this can serve to facilitate the certainty of the subject.
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Additional info for The Mechanistic Conception of Life: Biological Essays
Example text
As expressed in the gross anatomy of the animal, the right and left halves of the body are symmetrical. But it is my belief that such a symmetry exists in a chemical sense, as well as in an anatomical, by which I mean that symmetrical regions of the body are chemically identical and have the same metabolism, while non-symmetrical regions of the body are chemically different, and in general have a quantitatively or qualitatively different metabolism. In order to illustrate this difference it is only necessary to point out that the two retinae, which are certainly symmetrical, have an identical metabolism, while a region of the skin which is not symmetrical with the retina has a different metabolism.
It was known that sessile heliotropic plants bend F ig . — Positive heliotropism of the polyps of E u d en d riu m . The new polyp-bearing stems all grow in the direction of the rays of light which is indicated by an arrow in each figure. ) These animals bend in the same way to the light as the stems of positively heliotropic plants kept under similar conditions. F ig s . 18 their stems to the source of light until the axis of symmetry of their tip is in the direction of the rays of light. , certain hydroids and worms.
S ignificance of T ropisms for P sychology 49 vital economy of these creatures. As is well known, the mating of these insects takes place during the so-called nuptial flight. I found that among the male and female ants of a nest the heliotropic sensitiveness increases steadily up to the time of the nuptial flight and that the direction of their flight follows the direction of the rays of the sun. I gained the impression that this nuptial flight is merely the consequence of a very highly developed heliotropic sensitiveness.
