Botanical And Physiological Memoirs Consisting of I the Phenomenon of Rejuven
Botanical And Physiological Memoirs Consisting of I the Phenomenon of Rejuven
Arthur Henfrey
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This appearance is still more compli- cated, inasmuch as these fine tubular canals project from the internal surface of the shield, and a slight furrow externally corresponds with them. This condition is evident in Melosira distans, in which, owing to the greater depth of the furrow, the apparent perforations remain separated from the margin. The interstitial ring presents peculiarities of which we have no instance in the preceding genera. Its tenuity and the great variety of its extension are ...important characters. But here we must add the very important one of the changes it undergoes during observation. It is not uncommon to see the two halves of the articulation separate themselves slowly, and enlarge at the same time with the ring. This fact is not decisive in respect to the great question of the animal nature of these beings ; for it is not subject to a subsequent con- traction, and because in plants we have the analogy of Spirogyrce, in which, on the rupture of the outer tube, the extremities of the articulation, which were inflected like the finger of a glove, expand themselves as if by elasticity; but many facts controvert this inference.
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