ON nioTOGRArns of geological interest. 291 



An fixhibition of geological photographs was arranged in Section C 

 at the Cardiff meeting. 



Your Committee met at Cardiff and discnssed details of the work. 

 It was decided, on the recommendation of Dr. Tempest Anderson, to adopt 

 a standard mount of uniform size for preserving the photographs. The 

 style of mount adopted (known as tlie Zaehusdorf ' self-binding' mount) 

 is 15^ xl2 inches, and is fitted with a special guard perforated at reo-ular 

 intervals for binding. This is of sufficient size to hold one whole-plate, 

 or two half-plate, or four quarter-plate views. The views when mounted 

 may be readily arranged in any desired order, and additions or substitu- 

 tions efi'ected. A supply of mounts has been obtained, and the collection 

 is now in process of mounting and arrangement. Forms containino- 

 descriptive details of the photographs are affixed to the mounts. It has been 

 arranged to supply these standard mounts to donors of photographs who 

 are willing to mount their own views ; otherwise the cost of mountino- 

 will fall on the Committee. It is found necessary to have the photographs 

 properly mounted, not only for greater convenience of reference, but also 

 to preserve them from possible injury by handling. The value of the 

 collection is already considerable and will increase as it grows in num- 

 bers. 



A new circular (No. 4) was issued by the Committee in November, and 

 addi-essed to a large number of geologists and photographers (both profes- 

 sional and amateur), and also to scientific and photographic societies in all 

 parts of the kingdom. While the Committee much appreciate the help 

 that has been afforded fi'om so many quarters, they would urge upon 

 geologists generally the desirability of promptly assisting the scheme in 

 order that their work may be proceeded with as quickly as possible. The 

 Committee are indebted to the editors of 'Nature,' the ' Literary World,' 

 'English Mechanic,' 'Photographic News,' 'Amateur Photographer/ 

 ' Globe,' ' Illustrated London News,' and other periodicals for givino- 

 prominence to their scheme for collecting and registering geoloo-ical 

 photographs. 



The use of photographic processes for illustrating works on geology 

 i.s becoming more frequent. Daring excursions of the Geologists' Associa- 

 tion, several photographs have been taken by members from which ' tint- 

 blocks ' have been made to illustrate papers in the ' Proceedings ' of the 

 Association. In several counties active efforts are being made by local 

 bodies for photographic surveys, and it is hoped that important geological 

 phenomena may be made a feature of these surveys, and that copies of 

 such photographs will be added to the collection formed by your Com- 

 jnittee. 



Reference was made in the last report to the appointment of a Com- 

 mittee on photographs by the Geological Society of America. The plan 

 of this Committee is laid practically on the same basis as that of the 

 British Association, the objects being (I) to make a photo-geological survey 

 of America ; (2) to exhibit the collection at the annual meetings of the 

 Society ; and (.3) to publish a register of photographs received. The first 

 register for 1890 contains a list of 293 photographs. 



Tour Committee deem it satisfactory that steps are thus being taken 

 to carry out their own object in other countries. 



Mr. C. J. Alford, F.G.S., mining engineer (of Suffolk House, Lawrence 

 Ponntney Hill, London), offered a series of geological photographs of 

 subjects abroad, which the Committee were unable to accept owmo- to 



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