. The Canadian record of science. Natural history; Science. of this mineral. In some places these fragments of crystals make up the greater part of the rock, while elsewhere they are very rare. The larger individuals can often be observ- ed in the very act of breaking up, in which case the frag- ments are but very little separated from one another. In a microscopical inves- tigation we hardly find a hand-speci- men of a coarse gran- Fig. 4 ular variety which does not show to a certain degree the clastic structure, and in studying a large number of hand-specimens, we can follow step by step the
. The Canadian record of science. Natural history; Science. of this mineral. In some places these fragments of crystals make up the greater part of the rock, while elsewhere they are very rare. The larger individuals can often be observ- ed in the very act of breaking up, in which case the frag- ments are but very little separated from one another. In a microscopical inves- tigation we hardly find a hand-speci- men of a coarse gran- Fig. 4 ular variety which does not show to a certain degree the clastic structure, and in studying a large number of hand-specimens, we can follow step by step the transition from a rock which exhibits no cataclastic structure to one which con- sists almost entirely of broken grains in which there remain scarcely any traces of the original indi- viduals. Figures 3, 4 and 5 are made from microscopical pho- tographs of sections which were taken Fig. c». from three different places in the area; they show the progress of the granula- tion as seen under the microscope. A very remarkable fact which was mentioned in speak-. 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 Natural History Society of Montreal. Montreal : Natural History Society
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