. The mechanistic conception of life; biological essays. Life; Biology. 106 The Mechanistic Conception of Life. Fig. 38 Figs. 36, 37, and 38.—From nature. The origin ol tlie pattern on the yolk sac of a fish embryo {Fundulus heteroclitus). Fig. 36 is a drawing of the blood- vessels at the surface of the yolk sac at an early stage of development. The black pigment cells show no definite orientation in regard to the blood-vessels. Fig. 37, the same egg a few days later. Here we notice that some pigment cells show a tendency to creep on the blood-vessels. Fig. 38, the same egg stUl a few days lat
. The mechanistic conception of life; biological essays. Life; Biology. 106 The Mechanistic Conception of Life. Fig. 38 Figs. 36, 37, and 38.—From nature. The origin ol tlie pattern on the yolk sac of a fish embryo {Fundulus heteroclitus). Fig. 36 is a drawing of the blood- vessels at the surface of the yolk sac at an early stage of development. The black pigment cells show no definite orientation in regard to the blood-vessels. Fig. 37, the same egg a few days later. Here we notice that some pigment cells show a tendency to creep on the blood-vessels. Fig. 38, the same egg stUl a few days later. The black pigment cells have completely crept on the blood-vessels and formed a sheath around them. The red chromatophores are omitted in this drawing. This was the first observation proving that tropisms play a r51e in the arrange- ment of the organs in the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Loeb, Jacques, 1859-1924. Chicago, University of Chicago Press
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