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. 1870 Excerpt: ...It is clear, therefore, that the increase in size cannot be due to deposition from without. The matter deposited upon the inner surface of the capsule is always softer than its general substance, and the external surface of old capsules is cracked and ragged. In many of the alga? this external surface serves as a nidus ...
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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. 1870 Excerpt: ...It is clear, therefore, that the increase in size cannot be due to deposition from without. The matter deposited upon the inner surface of the capsule is always softer than its general substance, and the external surface of old capsules is cracked and ragged. In many of the alga? this external surface serves as a nidus for the development and growth of smaller alga?--a fact which clearly shows it has ceased to be active, is undergoing disintegration, and becoming fitted for the pabulum of other things, and is no longer capable of resisting the action of external conditions. This is the oldest part of the capsule which is now undergoing decay, and the small alga? are living in part upon the products thus produced. The new material is added upon the inner surface of the capsule, layer after layer, and where there are several layers the innermost is the youngest and the outermost the oldest portion of the structure. If this be so, it follows that the inanimate material for the nourishment of these structures must pass through the outer membrane, and be taken up by the living matter within, which communicates to it the same properties and powers which this living matter itself CHEMICAL CHANGES. 79 possesses, and which it has inherited from pre-existing particles. The nutrition of cells of epithelium of man is conducted upon the same plan. See p. St. At present we cannot get further than this. I am ignorant of the nature of the changes which occur, but I think the facts as I have stated them are true. Is a Tissue living because attached to a Living Organism. '--Some appear to think that a change in position only will make all the difference as regards the proper application of the term vital, and seem to hold that a tissue should be called alive as long as it re...
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