ox PHOTOGIUrHS OF GEOLOGICAL INTEREST. 547 



APPENDIX. 



Circular D'tter issued by the Committee. 



Toronto : March 15, 1898. 



Dear Sin,^ — At the meeting of the British Association for the 

 Advancement of Science, held in Toronto in 1897, the following Com- 

 mittee was appointed for ' The collection, preservation, and systematic 

 registration of Canadian photographs of geological interest.' Chairman, 

 Professor A. P. Coleman ; Secretary, Mr. AYm. A. Parks ; Professor A. 

 B. Willmott, Professor F. O. Adams, Professor W. W. Watts, and Mr. J. 

 B. Tyrrell. This Committee has decided to appeal to those interested in 

 geology and photography for assistance in preparing and improving the 

 collection, which will be kept in Toronto, and will be at all times open 

 to the public. The services of a competent photographer have been 

 procured, and it is proposed to furnish lantern slides or prints to any 

 desiring them at the cost of production. 



The value of such a collection cannot be over-estimited, as it will 

 furnish valuable material for the investigator or lecturer, it will preserve 

 and place on record geological scenery of an evanescent nature, and will 

 tend to stimulate geological investigation throughout the country. 



We shall be glad to receive and place to the credit of the donor either 

 negatives or prints of such subjects as are indicated in the following list, 

 or others in any way related to geological science : — 



Rocks and Bock Structure. — Cliffs and rock-surfaces ."^bowing stratifi- 

 cation, false -bedding, character of weathering, foliation, jointage, cleavage, 

 folding, faulting, veins, dikes, unconformities, contact zones of different 

 kinds of rocks, minerals and mineral aggregates, fossils, kc. 



Glacial rhenoinena. — Moraines (stony hills), eskers, kames, jierched 

 Ijoulders, glacial grooves and striae, (tc. 



Shores. — Sand dunes, sand spits, lines of boulders, cliffs of sand and 

 clay, ripple marks, (tc. 



Rivers. — Valleys, channels and gorges, banks in different conditions, 

 terraces, bottom lands, kc. 



Phenomena causedby Atmospheric Agencies. — Piain-marks, rill-channels, 

 washouts, sun- cracks, kc. 



New Railway Cuttings, Sand and Gravel Pits, <L'c. — It is of great 

 importance that the exact locality and date accompany the photograph, 

 and if possible the comjjass bearing of the centre of the picture from the 

 camera. 



Relying upon your co-operation, we request that you bring this com- 

 munication to the notice of those interested in this work in your locality. 



Very sincerely yours, 



Wm. a. Parks, Secretary. 

 Address : Wm. A. Paeks, B.A. 



Geological Department, University cf Toronto. 



