ON PIIOTOGKAPHS OF GEOLOGICAL INTEREST. 293 



desired to exclude smaller views when these are well-defined and clear. In the case 

 •of small negatives, when sharp, an enlargement to whole-plate size is desirable for 

 the purpose of a place in the collection. The views should be printed by a permanent 

 process whenever practicable. Isochromatic plates are strongly recommended to be 

 "used. 



III. In order to preserve its scientific value, each photograph should be accom- 

 panied by as many of the following details as can be conveniently given. Forms for 

 this purpose will be supplied on application. 



(a) Name and position of section or locality. 



(6) Special features shown, with illustrative diagrams, when necessary. 



(Further details may be given, if more convenient, on a separate tracing 



attached to the photograph.) 

 Cc) Height and length of section, and compass direction. 

 Id) Name and address of photographer, or of the society under whose direction 



the view is taken. 

 ((?) Date when photographed. 

 (/) Indication (where necessary) of direction of light and shade ; i.e., state 



whether taken in. ' direct light ' or ' in shade.' 



IV. Each photograph sent in for registration should bear a heal number, and the 

 accompanying form should be numbered in accordance therewith. 



V. Photographs should be sent unmounted. Mounts of uniform size, with per- 

 forated edges for binding, to hold one whole-plate, two half-plate, or four quarter- 

 plate views, have been prepared, and a number will be forwarded, on application, to 

 ilonors of photographs who prefer to mount their own prints. 



VI. Lists of photographs, copies of photographic prints and information relative 

 thereto should be sent under cover to the Secretary to the Committee, at the earliest 

 posdhle date, in order to facilitate the work of registration. 



THIRD LIST OF GEOLOGICAL PHOTOGRAPHS. 



(to JUNE, 1892.) 



Note. — This list contains the subjects of geological photographs, 

 copies of which have been received by the Secretary of the Committee 

 since the publication of the last report. Photographers are asked to 

 affix the registered numbers, as given below, to their negatives, for 

 convenience of future reference. 



Copies of any photographs desired can, in most instances, be obtained 

 either from the photographer direct or from the ofiBcers of the local 

 society under whose auspices the views were taken. 



The Committee in no case have assumed the copyright of photographs 

 registered, which is presumed to be held by the photographer. 



The price at which copies of photographs may be obtained depends 

 tipon the size of the print and local circumstances, over which the 

 Committee have no control. 



ENGLAND AND WALES. 



Cheshire. 

 Photograplied hy Pkiestlet & Sons, Egremont. Size 8x6 inches. 



Kegd. No. 



631 The ' Eed Noses,' New Cliffs of Banter sandstone 



Brighton 



632 Wave study at Egremont. Breakers in action 



