182 Reports and Proceedings — Geological Society of London. 



Your early work was done in the midst of an active and successful business career, 

 which you gave up, somewhat against the advice of your friends, to join the 

 Geological Survey and devote aU your energy to the progress of science. Of late 

 years you have been working in the Isle of Man, and the map of that island which 

 you have produced is a striking proof of your skill as a geological surveyor. Its 

 publication leads us to look forward with great expectations to the forthcoming 

 memoir. 



In awarding to you the Bigsby Medal, the CouucU feel that they are placing it in 

 safe hands. You have done much, and they confidently expect that you will do more. 



Mr. Lamplugh replied in the following words : — Mr. President, — 



It is not without a proper sense of responsibility that I receive this Medal. The 

 terms of the award leave no doubt that, while it is intended to some extent as 

 a recognition of work already done, it is essentially intended as an incentive to further 

 work, and implies a certain obligation in this respect, which you, sir, in your engaging 

 words have not attempted to lighten. The recipients of this Medal in the past have 

 always fulfilled the obligation, and it wiU indeed be a satisfaction to me if it be in 

 my power to prove my fitness for the trust reposed in me by this award. 



You have made reference to my altered circumstances since the time, ten years 

 ago, when my earlier work received kindly recognition from the Council of this 

 Society ; and it may, therefore, be permitted me to confess that, in deciding to devote 

 my whole energies to geological research, I felt some misgiving lest the studies which 

 had proved so congenial as a recreation should take on another aspect when made 

 the main occupation of my life. But the misgiving has proved groimdiess ; the 

 wider opportunity, so far from blunting my interest in these studies, has brought 

 fresh zest, and on every side has opened up ■vistas of promising work for the future. 



The President read his Anniversary Address, in which he first 

 gave Obituary Notices of several Fellows and Foreign Members 

 deceased since the last Annual Meeting, including Professor 0. M. 

 Torell (elected F.M. in 1883), Professor A. Milne-Edwards (F.M. in 

 1899) ; the Duke of Argyll (President in 1872-74) ; Mr. C. Tylden- 

 Wright (elected a Fellow in 1857), Mr. G. C. Greenwell (el. in 1858), 

 Mr. G. H. Morton (el. in 1858), General Pitt-Rivers (el. in 1867), 

 Professor G. H. F. Ulrich (el. in 1867), Mr. J. Thomson (el. in 

 1868), Mr. C. J. A. Meyer (el. in 1869), Mr. W. P. Sladen (el. 

 in 1872), Dr. John Young (el. in 1874), and Dr. W. Waagen 

 (el. in 1881). 



He then dealt with the evolution of petrological ideas during the 

 nineteenth century, especially as regards the igneous rocks. The 

 discussions as to the origin of basalt and granite were referred to, 

 and it was shown that the controversy regarding the latter rock 

 had contributed largely to the clearing up of our ideas as to the 

 nature of plutonic phenomena. 



The solution theory propounded by Bunsen was especially empha- 

 sized, and its modern developments were briefly sketched. It was 

 suggested that the next great advance will, in all probability, be the 

 result of experiment, controlled by the modern theory of solutions, 

 and carried out for the purpose of testing the consequences of that 

 theory and discovering the modifications which may be necessary to 

 adapt it to igneous magmas. The bearing which recent work on 

 alloys had on petrographical problems was also referred to. 



The problem of the origin of petrographical species was next 

 considered, and the growth of ideas on the subject briefly sketched. 

 It was pointed out that although magmatic difi'erentiation is accepted 

 by many as an important factor in producing different kinds of 



