ON AN EXPERIMENTAL INVESTIGATION INTO THE FLOW OF MARBLE. 401 
PLATE 25. 
Fig. 1. Microphotograph of a thin section of the Carrara marble (shown in Plate 24, 
fig. 1) deformed at the ordinary temperature in 7 hours. The dark areas 
are the granulated portions of the rock. Irregularly shaped fragments 
of calcite individuals, often distinctly twinned, are seen scattered through it. 
Photographed in ordinary light. X 70 diameters. 
Fig. 2. Microphotograph of a thin section of the same marble between the lines of 
granulated material. It presents a continuous mosaic of flattened grains. 
Photographed in ordinary light. X 50 diameters. 
Fig. -3. Microphotograph of a thin section of the Laurentian marble from Lot 12, 
Range V., of the township of Burleigh, Ontario. Presents a cataclastic 
structure identical with that shown by the deformed marble of fig. 1 of this 
Plate, but on a larger scale. The original rock was much more coarsely 
crystalline, and the granulation has not been so minute. The twisting and 
twinning of the large remnants in process of granulation is well seen. 
Photographed between crossed Nicols in polarised light. X 47 diameters. 
Fig. 4. Microphotograph of a thin section of the Laurentian marble from Lot 38. 
Range VIII., of the township of Anstruther, Ontario. The rock is identical 
in character with that shown in fig. 3, but the section represents a more 
thoroughly granulated portion. The structure is identical with that seen in 
the artificially deformed marble of fig. 1, but the granulation is not quite so 
minute. Photographed between crossed Nicols in polarised light X 70 
diameters. 
3 F 
VOL CXCV.—A. 
