. Outlines of natural theology for the use of the Canadian student [microform] : selected and arranged from the most authentic sources. Natural history; Natural theology; Sciences naturelles; Théologie naturelle. 261 appears to have sssentially different and independent ends in viewâif we may for the nonce speak meta- phoricallyâin thus separating the endoplast from the periplast. ⢠^j - " The endoplast grows and divides ; but, except in a few more or less doubtful cases, it would seem to undergo no other morphological change. It fre- quently disappears altogether ; but as a rule, it un
. Outlines of natural theology for the use of the Canadian student [microform] : selected and arranged from the most authentic sources. Natural history; Natural theology; Sciences naturelles; Théologie naturelle. 261 appears to have sssentially different and independent ends in viewâif we may for the nonce speak meta- phoricallyâin thus separating the endoplast from the periplast. ⢠^j - " The endoplast grows and divides ; but, except in a few more or less doubtful cases, it would seem to undergo no other morphological change. It fre- quently disappears altogether ; but as a rule, it undergoes neither chemical nor morphological meta- morphosis. So far from being the centre of activity of the vital actions, it would appear much rather to be a less important histological element. The peri- plast, on the other hand, which has hitherto passed under the names of cell-wall, contents, and intercel- lular substance, is the subject of all the most important metamorphic processes, whether morphological or chemical, in the animal and in the plant. By its differentiation, every variety of tissue is produced ; and this differentiation is the result not of any metabolic action of the endoplast, which has fre- quently disappeared before the metamorphosis begins, but of intimate molecular changes in its substance, which take place under the guidance of the * vis essentialis,' or, to use a strictly positive phrase, occur in a definite order, we know not why. The meta- morphoses of the pleriplastic substance are twofold âchemical and structural. The former may be of the nature either of conversion: change of cellulose. i' ^ *:â â [. 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 Bovell, James, 1817-1880. [Toronto? : s. n. ]
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