CORUBSPONDINa SOCIETIES. 191 



Section A. 



T&inperature Variation in Lakes, Ilivers, and Estuaries. — Dr. Mill said 

 that he wished to point out some of the results that had been obtained by 

 the Committee appointed to make the investigations in conjunction with the 

 local Societies represented in the Association. He had a diagram which 

 showed the work done more precisely than he could explain in a short 

 time. The Committee had twenty observers working at various rivers ; 

 most of these rivers were in Scotland, only one or two being in England, 

 while no observations had been started in Ireland. Their investi- 

 gations showed that while in some rivers, particularly the Aray, the 

 temperature was increased by rainfall, in others this condition was 

 reversed, the temperature being found to suddenly fall during rain. 

 He wished to impress upon the Delegates the advisability of extending 

 their observations throughout Scotland and England, and also of ex- 

 tending them to Ireland. Professor Fitzgerald, the President of Sec- 

 tion A, who was a member of the Committee, took a great interest in the 

 subject, and had expressed an opinion that Mr. Symons's rain-gauge ob- 

 servers micht make personal observations. Dr. Mill advised all observers 

 to use the thermometer which he exhibited, and which he said was durable 

 and cheap. He trusted that Delegates on returning home would lay the 

 subject before their Societies, give them some idea of the work of the 

 Committee, and induce them to co-operate and make ob.servations in their 

 respective localities. Circulars, he added, would be sent to the Societies 

 and to Mr. Symons's rain-gauge observers, and it was hoped that this 

 would bring the question well before them. It would give local Societies 

 an opportunity of doing what they professed to do, and he was perfectly 

 certain they were anxious to promote real scientific work. The observa- 

 tions could be made with very little training, and the investigations of 

 conscientious observers would lead to interesting results, as they would 

 be considered by the Committee in connection with the temperature and 

 rainfall of the districts in which they were made.' 



In reply to questions by Mr. Cashing and the Rev. E. P. Knubley, 

 Dr, Mill said that the thermometer readings were taken at a depth of 

 six inches below the surface of the water, and that the fullest particulars 

 would be supplied by the Committee to any Society wishing to take part 

 in the observations. 



Section B. 



No recommendations sent or suggestions made. 



Section C. 



Professor Lebour, who had been nominated as the representative of 

 the Committee of this Section, said that the Committees on (1) Sea-Coast 

 Erosion, (2) Underground Waters, (3) EiTatic Blocks, and (4) Earth 

 Tremors, the working of which had been explained to the Delegates on 

 former occasions, had been recommended for reappointment. 



Oeological Photography. — Professor Lebour further informed the Dele- 

 gates that in consequence of a paper read before Section C by Mr. O. W. 

 JefiFs on local geological photographs, it was proposed by the Committee of 

 the Section that a Committee should be appointed to collect and register 

 such photographs. The proposal at present was so indefinite that there 



» liejiort, 1888, p. 326. 



