Excerpt from Quarterly Journal of Microscopical Science, 1897, Vol. 39 The fact that the tint of the worm is due to contained blood, and not to any pigment in the skin, is readily recognised by the unaided eye when the alternating processes of eversion and retraction of the proboscis or introvert is watched. So long as the introvert is at rest within the body the thorax is coloured; when eversion takes place the tint becomes quite faint (pl. 1, fig. - in fact, frequently the thorax becomes white. The blood in the thorax is ...
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Excerpt from Quarterly Journal of Microscopical Science, 1897, Vol. 39 The fact that the tint of the worm is due to contained blood, and not to any pigment in the skin, is readily recognised by the unaided eye when the alternating processes of eversion and retraction of the proboscis or introvert is watched. So long as the introvert is at rest within the body the thorax is coloured; when eversion takes place the tint becomes quite faint (pl. 1, fig. - in fact, frequently the thorax becomes white. The blood in the thorax is contained in greatly dilated vessels, which block up and obliterate nearly the whole of the coelom (fig. The introvert is a hollow sac traversed by thin bundles of retractor muscles, the cavity of the sac being con tinuous with the dilated vessels, so that on eversion nearly the whole of the blood in the thorax is driven into the introvert this flow of blood is, of course, the cause of the eversion, - and the thorax is more or less completely deprived of its colour. The fact that the abdomen is not tinted by the blood to any great degree is due to the small size of the blood-vessels in this region. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at ... This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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