232 EEPOKT— 1902. 



in mounting it. But it has a further use, which is much more appreciable 

 novr that the collection and accessions are so large, and that less acces- 

 sible and less known districts are being photographed ; by grouping his 

 numbers the contributor can help the Committee in the difficult task of 

 grouping the prints for mounting, a most important thing when large 

 series haA'e to be dealt with from a district not personally known to the 

 Secretary or his friends. 



Although a few photographs and slides for the duplicate series have 

 been received during the year, notice of them is withheld for the present. 



The duplicate collection has been sent to natural history societies at 

 the following places : Birmingham, Bristol, Croydon, Belfast, and Leeds. 



The first issue of the published series of geological photographs has now 

 reached the subscribers. Twenty-two prints and slides taken from nega- 

 tives lent by thirteen contributors have been issued, accompanied by 

 printed descriptions written by fourteen geologists. To contributors and 

 subscribers the Committee wish to give their best thanks. The Secretary 

 has received many kindly expressions of satisfaction from the subscribers, 

 amongst whom are many foreignei's living all over the world. 



It is hoped that the second issue will be complete within this year, as 

 the selection has already been made and some of the work is in hand. 



Applications by Local Societies for the loan of the duplicate collection 

 should be made to the Secretary. Either prints or slides, or both, can be 

 lent, with a descriptive account of the slides. The carriage and the 

 making good of any damage to slides or prints are expenses borne by the 

 borrowing society. 



The Committee recommend that they be reappointed, with a small grant, 

 and that Professor S. H. Reynolds, jMr. A. K. CoomarasM-amy, and Mr. 

 J. St. J. Phillips be added to their number. 



THIRTEENTH LIST OF GEOLOGICAL PHOTOGRAPHS. 



(To August 27, 1902.) 



This list contains the geological photographs 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. 

 Their own numbers are added in order to enable them to do so. 



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

 fi'om the photographer direct, or from the officers of the local society 

 under whose auspices the views were taken. 



The price at which copies may be obtained depends on the size of tlie 

 print and on local circumstances over which the Connnittee have no conti'ol. 



The Committee do not assume the co})yright of any 2}hotor/raphs 

 included in this list. Inquiries respecting photographs, and applications 

 for permission to reproduce them, should be addressed to the photographers 

 direct. It is recommended that, wherever the negative is suitable, the 

 print be made by the cold-bath platinotype process. 



The very best photographs lose half their utility, and all their value 

 as documentary evidence, unless accurately described ; and the Secretary 

 would be grateful if, whenever possible, such explanatoi-y details as can 

 be given were written on the forms supplied for the purpose, and not on 



