CORRESPONDING SOCIETIES. 65 



If Mr. Harrison's suggestions were to be efficiently and rapidly carried 

 out, the speaker could not conceal from himself the enormous amount of 

 woi-k to be done and the practical difficulties in the way. It would almost 

 seem to need an independent Society, a central home, a depository for 

 completed work, a secretary, and a grant for office expenses. He begged 

 the Delegates to remember the magnitude of the subject, and suggested 

 that the discussion should deal with the principle involved, rather than 

 with the mass of detail which had occupied the second part of the paper. 



Mr. T. Sheppard (Yorkshire JSTaturalists' Union) thought that the 

 difficulties to be surmounted were, perhaps, not quite so serious as had 

 been suggested by the previous speaker. Already the British Associa- 

 tion, with its Geological Photographs Committee, was doing excellent 

 work as regards geological photography. He believed also that there 

 was a Botanical Survey Photographs Commiitee and an Ethnographical 

 Committee doing similar work. If the various Societies affiliated 

 with the British Association made up their minds to set to work, as the 

 Geological Section had done, good would result. If, however, the matter 

 was allowed to drop so soon as this Conference was over, it was useless 

 to approach the General Committee for a grant or for anything else. In 

 Hull the photographic Society had already done good work by taking 

 careful photographs of the local archfcological and architectural features, 

 which were sent to headquarters, while a duplicate set was placed in the 

 public museum. 



The Rev. R. Ashington BuUen (South-Eastern Union of Scientific 

 Societies) said that there were now three County Photographic Surveys 

 affiliated to the Union which he represented — viz. those of Surrey, Kent, and 

 Sussex. A much appreciated feature of the Annual Congress of the S.E. 

 Union was the yearly exhibition by the above-named surveys of the photo- 

 graphs taken during the previous year. It appealed to many different 

 intellectual tastes, and he thought that during a British Association 

 meeting an exhibition by the particular survey of the county in which 

 the meeting was being held would be an added attraction, and would 

 appeal to the varied interests of the members. 



Mr. W. F. Stanley (Croydon Natural History and Scientific Society) 

 suggested that the most convenient size for photographs of interest was 

 quarter-plate, as these might be taken with the kodak commonly carried 

 by members of local Societies. Also that films (which were now made 

 very imperishable) were light, and easily stored without risk of breakage. 

 These were valuable for producing lantern-slides for lectures or enlarge- 

 ments. Some lantern-slides of Old Croydon, taken in this manner by 

 Mr. Low Sargeant twenty- five years ago, were unique, and had become 

 very valuable for reference. 



Professor H. H. Turner (Oxford) remarked that the value of survey 

 photographs would be greatly enhanced if they could be taken on the 

 stereoscopic plan, from two points of view. Such pairs of photographs 

 would provide material for making a ground-plan of the objects photo- 

 graphed. The measurements and calculations were very simple : he 

 begged lea\-e to refer those interested to a paper of his own ' On a Simple 

 Method of Accurate Surveying with an Ordinary Camera,' in the Monthly 

 Notices of the Royal Astronomical Society, vol. Ixii. p. 126 (December 

 lt)01). 



Mr. Rudler (Essex Field Club) desired to call attention to the excellent 

 work being done by the ' Photographic and Pictorial Survey and Record 

 1906. J ^ t ^ s 



