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DIVISION OF MINERALOGY (Geological Survey) 
Eugene Poitevin, Chief of the Division, reports: 
Laboratory Work 
During the fiscal year just ended Eugene Poitevin and H. V. Ells- 
worth have examined and described a very large number of minerals and 
rocks sent in from various parts of Canada by mining organizations, 
departmental officers, prospectors, and others interested in the mineral 
industry. Over five hundred written reports were issued and a large 
number of verbal reports were furnished to visitors and departmental 
officers. Altogether more than four thousand specimens were studied and 
reported upon, which is considerably more than last year. 
In addition to his duties as Chief of the Division, Eugene Poitevin 
has, at the request of the Ontario Department of Health, continued his 
investigations of mineral residues obtained from human silicotic lungs. 
So far, he has studied twenty-three lungs and the work is still in progress. 
A special report on the subject is being prepared. 
H. V. Ellsworth continued work on the rare-element minerals, radio- 
active minerals, and vanadium. He also spent considerable time on 
spectroscopic investigations on behalf of other departments, on research 
involving the analytical chemistry of vanadium and chromium, and on 
the determination of tellurides from various gold mines. 
R. J. C. Fabry has carried on the following chemical analyses: 
Two samples of kaolin: from north, of highway near Willows, Sask., for F. J. Fraser. 
Norite: east of Ross mine, Foy tp., Sudbury dist., Ont., for W. H. Collins. 
Andesite: Beaver hill, Dufresnoy tp., Abitibi co., Que., for M. E. Wilson. 
Rhyolite: north Waite trail, Duprat tp., Abitibi co., Que., for M. E. Wilson. 
Concretion: Grand Lake, N.S., for iron and manganese, for E. M. Kindle. 
For H. C. Cooke: 
Asbestos: Deloro tp., Porcupine dist., Ont. 
Q. A. C., Ltd., lot IS, range XI, Broughton tp., Que. 
Johnston mine, Thetford, Que. 
Beaver mine, Thetford, Que. 
King mine, Thetford, Que. 
Vimy Ridge, southwest of Black Lake, Que. 
Bell pit, Thetford, Que. 
British Canadian pits, Blank Lake. 
Asbestos-like fibre: King mine, Thetford, Que. (2). 
Serpentine: Larnbly mine, Coleraine, Que. 
Lot 19, NW., range X, Coleraine tp., Que. 
Slip serpentine: King mine, Thetford, Que. (2). 
Peridotite: Frechette pit, Coleraine tp., Que. 
Bell pit, Thetford, Que. 
Alt. peridotite: Frechette pit, Coleraine tp., Que. 
Picrolite: King mine, Thetford, Que. (2). 
Picrolite (brucite?) : King mine, Thetford, Que. 
Talcose alteration product: Bell pit, Thetford mine, Que. 
Pseudo-asbestos: north of Robertsonville, Thetford tp., Que. 
Fault fibre: King mine, Thetford Que. 
Serpentine: Bell pit, Thetford, Que. 
In addition, the usual routine tests for the commoner elements occur- 
ring in samples brought in or mailed to the division were carried out 
throughout the year (Ni, S, P, etc.). 
