Studies on fermentation : the diseases of beer, their causes, and the means of preventing them . iculatus. * The principal result of Dr. Eees labours consists in the discovery ofa sponilation peculiar to yeast cells, that is to say, to a formation in theinterior of these cells, and under particular conditions—such as whenthe growth occurs on slices of cooked potatoes, carrots, &c.—of two,three, or four smaller cells, which, when placed in fermentable liquids,act like the germinating spores of ferments. The mother-cell may beregarded as an ascus, and the daughter-cells as ascospores, and so the
Studies on fermentation : the diseases of beer, their causes, and the means of preventing them . iculatus. * The principal result of Dr. Eees labours consists in the discovery ofa sponilation peculiar to yeast cells, that is to say, to a formation in theinterior of these cells, and under particular conditions—such as whenthe growth occurs on slices of cooked potatoes, carrots, &c.—of two,three, or four smaller cells, which, when placed in fermentable liquids,act like the germinating spores of ferments. The mother-cell may beregarded as an ascus, and the daughter-cells as ascospores, and so thegenus sncchnromyces may be classified among the group of fungi termedascomycetes. These facts have been frequently confirmed, notably by STUDIES ON FERMENTATION. 151 The same savant has given the name of saccharomycespastoriamis to the yeast of the secondary fermentations of sweetliquids, such as wine that has remained sweet after its prin-cipal fermentation. We have described this yeast in a Notepublished in 1864, on the diseases of wine, from which wegive the following extract:—*. Fig. 28. Fig. 6 (Fig. 28 in this work) represents a very interesting Dr. Engel, professor of the Faculty of Medicine, at Nancy. Previouslyto Dr. Rees discovery, M. de Seynes {Comptes rendus, t. Ixvii., 1868)had described an endogenous formation of spores in mycoderma vini,particularly in the elongated cells, followed by the rupture of thomother-cell, and subsequent absorption of cell-walls and other contentsafter the issue of the endospores, which we have just termed ourselves had also previously called attention to those refractivecorpuscles which appear amongst vibrios as probably being reproductivecorpuscles, and we had hkewise witnessed the reabsorption of the partssurrounding them. The plate on page 228 of our Studies on the Silk-worm Disease represents the phenomena in question. * See Comptes rendus de VAcademie des Sciences, vol. Iviii. p. 144. 152 STUDIES ON FERMENTATION.
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