. Calcutta journal of natural history, and miscellany of the arts and sciences in India. ited forthese investigations, because the mother-cellules contain amuch less number of granules than those of all the otherCrytogamae which I have examined ; and in which I hope tofollow more easily the formation of the membranes of theSporae. So much the more do I conceive it my duty to pub-lish the result of my inquiries, as in many instances they willconfirm the theory of M. de Mirbel, and may also contributeto dispel the difference of opinion which exists between thismost learned man and me. I shall co
. Calcutta journal of natural history, and miscellany of the arts and sciences in India. ited forthese investigations, because the mother-cellules contain amuch less number of granules than those of all the otherCrytogamae which I have examined ; and in which I hope tofollow more easily the formation of the membranes of theSporae. So much the more do I conceive it my duty to pub-lish the result of my inquiries, as in many instances they willconfirm the theory of M. de Mirbel, and may also contributeto dispel the difference of opinion which exists between thismost learned man and me. I shall commence by indicating in a few words the pointson which I entertained the same opinion as M. de Mirbel,and those on which we differed. In his Memoire on the Marchantia, M. de Mirbel consi-dered the Sporae of this plant, as well as those of Targioniaas simple cellules or utricules, and assures us that they * From the Annates des Sciences Naturelles, April 1840, communi-cated to the Calcutta Journal Natural History, by Jos. MClelland, M. D. falaUtsxJ^ar/i. •&£< HUtK vdn- On the development of the Spores of Anthoceros Icevis. 79 are produced three or four in number from the interior ofother cellules. He gives no detail of the manner by which this is per-formed, but he exposes, in the most detailed manner, theanalogous fact, the development of the pollenic grains, espe-cially those of the Citrouille. In this case the membrane of the cellules in which thepollenic grains are found, and which is full of a granularmucilaginous substance, becomes gorged with juice, and swol-len to such a degree that it assumes a considerable thick-ness ; on its internal surfaces there are four septa produced,which direct themselves toward the centre of the cellule,and divide its contents into four parts, and uniting in thecentre of the cellule in such a manner that the cellular ca-vity is divided into four compartments entirely there is formed in each of those compartments, an
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