44 REPORT 1891. 



tion of meteorological plaeuomena such as the forms of clouds, lightning 

 flashes, the effects of storms, &c. It would be the function of such a 

 Committee to collect the photographs and keep a register of them, which 

 would be added to from year to year. The study of the forms of clouds 

 would be more satisfactory if undertaken by a comparison of photographs 

 than by di-awings. Mr. Hopkinson referred to the practical difficulty of 

 photographing light clouds in a blue sky, and suggested that it might 

 form part of the work of the Committee to investigate methods for 

 eflecting this object. With respect to lightning flashes he stated that 

 numerous photographs had been taken, some of which were very valuable, 

 but others were useless owing to the failure on the part of the photographer 

 to indicate the position of the plate in the camera. The advisabiHty of 

 interesting the Corresponding Societies in the work was pointed out to 

 the Delegates by Mr. Hopkinson, who also urged the special necessity of 

 securing as soon as possible photographs showing the after-efi'ects of 

 storms. It was proposed that a Committee of the Association with a 

 small grant should be formed through Section A. If this Committee were 

 sanctioned Mr. Symons and Professor Meldola would consent to serve on 

 it, and Mr. A. W. Clayden, who had made a special study of the 

 photography of clouds and lightning flashes, would be willing to act as 

 Secretary. 



After some discussion as to the mode of procedure it was decided that 

 application should be made through the Committee of Section A for the 

 formation of a Committee on Meteorological Photography, and that 

 the application should be also supported by a recommendation from the 

 Conference of Delegates to the Committee of Recommendations. 



Section C. 



Sea Coast Erosion. — Mr. Topley stated that the Committee appointed 

 for this purpose would be glad to receive any as.sistance. Some of the 

 ■Corresponding Societies had applied for forms, but nothing had as yet 

 been done. Three years ago the Isle of Man Society had proposed to 

 take the matter in hand and form a Committee. He believed some of the 

 Yorkshire Societies were doing good work, but they had not yet received 

 the results. 



Erratic Blocks. — The Rev. B. P. Knubley stated, with reference to 

 the work of this Committee, that the Yorkshire Naturalists' Union had 

 been caiTying on the records satisfactorily, and that about twenty-five 

 reports had been presented during the year. These had been sent to Dr. 

 Crosskey, the Secretary of the Committee. 



Oeological Photography. — Mr. O. W. Jeff's stated that, through the 

 action of the Conference of Delegates at previous meetings of the British 

 Association, a Committee had been appointed for collecting and reporting 

 on geological photographs. Very material assistance had been rendered 

 to the work of this Committee by various Delegates from the several 

 Corresponding Societies, many of which had sent photographs or lists of 

 those that had been taken. All that had been done thus far was of a 

 preliminary character, and had consisted in arranging the photographs 

 which had been taken in order to select those which illustrated well- 

 defined strata or sections. The work was by no means complete, and the 

 report, which would shortly be presented, showed that a very large 



