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made of the rock are herewith given, and refer to the chemical com- 
position, to the crushing strength of the stone, and to the microscopical 
characters of the same, besides a note on the absorption of moisture by 
the same limestone. 
i and 2. Chemical composition and ratio of absorption, determined 
by Dr. B. J. Harrington, of McGill College, Montreal. 
CERTIFICATE OF DR. B. J. HARRINGTON. 
" The specific gravity of the stone was found to be 2.704, and the 
weight of a cubic foot deduced from these figures 168.5 lbs.,(i cubic foot 
of water being taken at 62.321 lbs). The analysis shows the stone to 
consist almost entirely of calcium carbonate, 'with a little insoluble 
matter and small quantities of the carbonates of magnesium and of iron. 
The exact figures are as follows : 
Insoluble (including a little organic matter) 2.75 
Calcium carbonate 94-7 
Magnesium " 2.37 
Ferrous : o. 1 8 
100.00 " 
As to the ratio of absorption of water by the limestone from Rock- 
land, the following is an extract from a letter by Dr. Harrington dated 
28th April, 1893 : 
" The absorption of your specimen of limestone was almost nil. 
The exact figures were 0.03 of a part of water absorbed by 100 parts by 
weight of the 'stone. That is an absorption ratio of 7375-33." 
(Signed.) B. J. Harrington. 
McGill College, 31st March, 1893. 
3. Macroscopic and Microscopic Examination of the Rockland limestone, 
by Prof. A. P. Coleman, of the School of Practical Science, Toronto. 
The following is the text of a report by Dr. Coleman, of Toronto, 
entitled : " Examination of Building Stone for Mr. Archibald Stewart 
Ottawa. The specimen sent for examination is a cube of dark grey 
bituminous limestone from a quarry at Rockland, Ontario. Micro- 
scopically the stone is compact in texture with included crystals of 
