Science-gossip . tions,of warmth and moisture. What does he mean by? initial impulse ? Surely it depends upon thosevery conditions, and is not a thing to be spoken ofapart from them. It is, one would think, a little-difficult to accept M. Gautiers explanation of theloss of vitality of seeds. Modification of the-chemical principles of the protoplasm argues arearrangement of the molecules composing it; butthere has been no proof yet of any such modifica-tion. We believe that Dr. Wallers experiments-upon the blaze-reactions of living seeds whichwere mentioned in a jDrevious paragraph (,.ante
Science-gossip . tions,of warmth and moisture. What does he mean by? initial impulse ? Surely it depends upon thosevery conditions, and is not a thing to be spoken ofapart from them. It is, one would think, a little-difficult to accept M. Gautiers explanation of theloss of vitality of seeds. Modification of the-chemical principles of the protoplasm argues arearrangement of the molecules composing it; butthere has been no proof yet of any such modifica-tion. We believe that Dr. Wallers experiments-upon the blaze-reactions of living seeds whichwere mentioned in a jDrevious paragraph (,.ante, p. 31) throw much light upon the under-standing of this interesting problem. Isolated Elements in Leaf of Araucaria.—There is an interesting instance of the deposit ofraphides, or crystals of calcium oxalate, in thewalls of certain elements in the case of some thick-walled, irregularly shaped cells that are to befound scattered throughout the leaf of find at certain parts of the mesophyll large. Fig. 2. Largk [hick-walled cell from leaf ofAraucarfa excelsa. a. Cell of the spongy parenchyma, r. Tliick-walled element irethe WciUs of which raphides have been deposited. /. Lati-ciferous cell. r. Raphides. stellate elements with rather thick walls, whichlatter ha^e deposited in them numerous smalBcrystals, rhombic in form, that can be seen toextend throughout the whole thickness of the-wall, and even deposited on the outer surface (seefig. 2). These isolated elements are surroundedby the ordinary large colls of the spongy paren-ciivma, and have in their vicinity an occasional SCIENCE- GOSSIP. laticiferous cell, which stains deeply with toluidinblue. The wall of our isolated element also stainswell with that substance. Another point to benoted is the presence of very fine nuclei in thecells of the spongy parenchyma of a size which onerarely sees in other plant-cells. A Conjugating Yeast.—Under certain con-ditions of existence Saccharomyces seems topossess the power
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