The microscope and its revelations . iety of Manchester, vol. Mr. G. Busk, whUst adducing additional evidence of the Vege-table natm-e of Volvox, in his extremely valuable Memoir ui the Transactionsof the ilicroscopical Society, 2nd Series, vol. i., called iu question some of theviews of Prof. Williamson, which were justified by that gentleman in hisFurther Elucidations in the same Transactions.—The Author has endea-voured to state the fads ru which both these excellent observers agree (andwhich he has himself had the opportunity of verifj-ing), with the interpreta-tion that se
The microscope and its revelations . iety of Manchester, vol. Mr. G. Busk, whUst adducing additional evidence of the Vege-table natm-e of Volvox, in his extremely valuable Memoir ui the Transactionsof the ilicroscopical Society, 2nd Series, vol. i., called iu question some of theviews of Prof. Williamson, which were justified by that gentleman in hisFurther Elucidations in the same Transactions.—The Author has endea-voured to state the fads ru which both these excellent observers agree (andwhich he has himself had the opportunity of verifj-ing), with the interpreta-tion that seems to him most accordant with the phenomena presented by otherProtophytes; and he believes that this interpretation harmonizes with what ismost essential in the doctrines of both, their diflerences having been to a certaindegree reconciled by their mutual admissions. 286 MicEoscopic rouMs or vegetable life. arrangement (Eig. 71). These projections are generallyformed by the outer coat alone, which possesses an almost Fi&. Various species of Staurastrum :—A, S. vestitum; b, S. aculeatum;c, ; D, E, S. brachiatiim. horny consistence, so as to retain its form after the dischargeof its contents (Iigs. 74,e, 75,b), but which does not includeany mineral ingredient, either calcareous or siliceous, in itscomposition. This outer coat is surrounded by a very trans-parent sheath of gelatinous substance, which is sometimesvery distinct (as shown in Fig. 77), whilst in other casesits existence is only indicated by its preventmg the contact ofthe cells. The outer coat encloses an inner membrane, whichis not always, however, closely adherent to it; and this imme-diately surrounds the coloured substance which occupies thewhole interior of the celL It is quite certain that the Desmi-diacese, like the Confervoid Plants in general, grow at the ex-pense of the inorganic elements which surround them, instead ofdepending upon other living beings for their subsistence; andthat the
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