326 



BEPORT 1888. 



difficulty is often encountered in keeping pace with new exposures, 

 borings, or sections, which are quickly built-up, choked, or otherwise 

 effaced. In a region which is taken as a type, and upon which thousands 

 of pages have been written, every new fact is of great general importance 

 in elucidating many of the most important questions in dynamical geology. 

 In conclusion, I would express my thanks for kind assistance to Mrs. 

 Guppy and my wife ; and to Messrs. D. Roberts, Chartier, W. H. Bell, 

 Ohlsen, A. Minozzi, and many others, in either providing me with 

 specimens, data, or permission to visit their works. 



Rejport of the Comr)iittee, consisting of Mr. John Mureay (Secre- 

 tary), Professor Chrystal, Dr. A. Buchan, Rev. C. J. Steward, 

 Hon. E. Abercromby, Mr. J. Y, Buchanan, Mr. David Cun- 

 ningham, Mr. Isaac Roberts, Dr. H. R. Mill, and Professor 

 Fitzgerald, appointed to arrange an investigation of the 

 Seasonal Variations of Temperature in Lakes, River's, and Es- 

 tuaries in various parts of the United Kingdom in co-operation 

 with the local societies represented on the Association. 



The work of the Committee has been confined to testing the methods for 

 carrying on a series of systematic general observations on the temperature 

 of the surface water in streams, lakes, estuaries, or sea. To be satisfac- 

 tory such observations must be conducted simultaneously for a period of 

 several years in as many parts of the country as possible. Volunteer 

 observers will be necessary, and for this purpose it seems to the Com- 

 mittee eminently desirable to obtain the co-operation of local societies, 

 the members of which might feel disposed to take up the work for a 

 definite time. During the present year a commencement has been made 

 in Scotland. There were twenty observers at work for the Committee, 

 supplied with thermometers of a uniform pattern. Observing books 

 ruled for date, hour, temperature of air and water, and remarks on state 

 of river and weather, were provided, with full printed instructions at the 

 beginning of each book for properly and uniformly makmg the observa- 

 tions. The names of observers and their stations were as follows, and we 

 have to thank these gentlemen for their services : — 



