. Nature through microscope & camera [microform]. Natural history; Photomicrography; Sciences naturelles; Photomicrographie. HI I iW^ REV. F. WOLLE'S OPINIONS 107 the contents of the cells and the whole tissue of the plants have gone except the siliceous coats. The mass is from a fresh-water lake in Australia. Year after year the diatoms in myriads lived for a short time in the water; when dead, the organic portions decayed, and the remaining imperishable siliceous coats fell to the bottom of the lake, and in time formed the pure deposit of which this is a fragment. 'As regards the longevi
. Nature through microscope & camera [microform]. Natural history; Photomicrography; Sciences naturelles; Photomicrographie. HI I iW^ REV. F. WOLLE'S OPINIONS 107 the contents of the cells and the whole tissue of the plants have gone except the siliceous coats. The mass is from a fresh-water lake in Australia. Year after year the diatoms in myriads lived for a short time in the water; when dead, the organic portions decayed, and the remaining imperishable siliceous coats fell to the bottom of the lake, and in time formed the pure deposit of which this is a fragment. 'As regards the longevity of diatoms,' says the Eev. F. Wolle (Diatomacea of North America), 'it may be said that dried speci- mens cannot be revived, but they have been known to survive nearly a quarter of a century in their natural ele? lent, even though kept for long periods in the dark, and at times frozen in solid ice. Their siliceous covering is almost indestructible, resisting the strongest acids and passing unscathed through vexy high degrees of heat.' Specimens for mounting can readily be collected in a wide-mouth bottle, with some fine muslin to act as a net. When the .; Urn. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Kerr, Richard, d. 1915. Toronto : Musson
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