In 1905 the bulk of Proceedings increased so much that it split into two series: Series A (papers on the Mathematical, Physical and Engineering sciences) and Series B, (Biological sciences). Included in the publication was the Anniversary meeting and reports.
By the 3rd volume the abstracts were arranged under the order in which the papers had been read at the meetings the report of each discussion meeting was headed by a brief account of the business which preceded the reading of the papers. Possible mechanisms that may account for the observed growth patterns are discussed.Ī meeting of the Council on May 10th, 1832 resolved that abstracts of papers submitted for publication in the Philosophical Transactions from the year 1800 be published in Proceedings. These spicules grow unidirectionally from one extremity at a rate of 12.0 μ m/h, and are thickened at some distance from the necleation site. Two calcification sites are involved in the secretion of curved monaxon spicules. Slender monaxon spicules are deposited very fast (more than 65 μ m/h). Crystallographically different rays of the triradiates differ in the dynamics of formation as well. Triradiate spicules are deposited from the centre towards the rays. We suggest that different mechanisms are involved in the growth of various spicule types. Morphological, crystallographic and fluorescence analyses have enabled the investigation of the growth patterns of the different spicule types. We found that spicule production is dependent on various conditions such as location in the sponge body and illumination, whereas the calcification rate by the spicule-forming cells is constant. have been studied by using calcein marking. Growth of various calcitic spicules from Sycon sp. Morphogenesis of different-shaped biogenic crystals presents one of the important biomineralization problems.
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