ON PHOTOaRAPHS OF GEOLOGICAL INTEREST. 475 



matter so prominently before their membera. It is hoped tliat by next 

 year contributions from several localities not hithei'to represented in the 

 collection will be received as the result of the special efforts now being 

 made with this object. 



Tour Committee held a meeting at Edinburgh on August 5, 1892^ 

 and discussed plans for the furtherance of the work. Among other 

 matters it was decided to obtain an expression of opinion from members 

 who are practical photographers as to the best form of camera for use in. 

 the field. In geological expeditions it is necessary to consider the weight 

 of impedimenta when the distance traversed is long or arduous. Several 

 members advocated a small ^-plate camera or 'Kodak,' from the negatives 

 of which enlargements can be made — a plan successfully adopted in several 

 instances. Mr. J. Hopkinson finds this form of instrument less successful 

 with Tertiary sections, and writes : ' They require monochromatic or 

 orthochromatic plates.' The best photograph for the Committee's purpose 

 is that which shows the details of rock-structure most clearly, irrespective 

 of size of plate. The Committee will be glad to hear the further opinions 

 of members as to suitable instruments for field photography. 



Several applications have been received for the loan of photographs 

 from the collection for the purpose of being exhibited at soirees and 

 meetings of local societies. In view of the risk of loss and deterioration 

 of photographs so transmitted and for other obvious reasons, the Com- 

 mittee, while appreciating the general interest shown in their scheme^ 

 regret their inability to sanction the loan of any part of the collection. 

 In order, however, to meet the wishes of societies who may desire to show 

 their members examples of the photographs collected by the Committee, 

 it has been decided to form an album containing duplicates of selected 

 views, which will be available for the use of societies who may apply for 

 the same for purposes of exhibition. Donations of duplicate prints will 

 be welcomed for this purpose. Applications for the loan of an album of 

 duplicate views should be addressed to the Secretary. Up to the present, 

 only some half-dozen duplicates have been received ; but it is hoped that 

 this number will be considerably augmented. It is proposed to include 

 in the ' duplicate ' series about fifty photographs. These will be useful 

 in spreading information in various quarters as to the requirements 

 of the Committee and the progress of their scheme for the collection of 

 geological photographs, and will doubtless lead to an extended interest 

 being taken in the subject. 



It may be mentioned that the Secretary was enabled during last 

 winter to deliver several lectures on the work of the Geological Photo- 

 graphs Committee in Liverpool, Chester, Manchester, Birkenhead, 

 Rochdale (on the invitation of the Rochdale Literary and Scientific 

 Society), and elsewhere. The lectures were illustrated by lantern slides 

 taken from photographs in the collection and from other sources. 



At the Edinburgh meeting a large selection from the collection was 

 exhibited in a room placed at their disposal by the Committee of 

 Section C. The series was augmented by special exhibits of enlarge- 

 ments by Dr. Tempest Anderson and Mr. W. Lamont Howie, to whom 

 the Committee beg to tender their thanks. In this I'oom were also 

 exhibited a series of photographs taken under the superintendence of the 

 Geological Survey of Scotland. 



The number of photographs now brought together precludes the 

 possibility of the whole being arranged for exhibition at every meeting of 



