Dr. J. J. Harris Teall, M.A., F.R.S. 3 



In consequence Dr. F. H. Hatch was appointed in 1886, and his 

 attention was given mainly to the eruptive rocks. 



At this time the problems connected with the age and structure 

 of the schistose rocks of the Highlands were attracting particular 

 attention on and off the Geological Survey, and it was of paramount 

 importance that the field-statf should have the advice and assistance 

 of one who would bring to their aid the pi'ceise methods of petro- 

 logical science. 



To quote the words of Sir Archibald Geikie — 



" The duties devolvia"^ oa the Petrographical Department of the Survey have 

 increased so much in recent years, and are of sucli essential consequence for the field- 

 work and the Memoirs, as Avell as for the Museum, that I found it necessary to apply 

 for additional assistance. Taking advantage of Mr. Bristow's retirement, I sub- 

 mitted to the Department a proposal for the appointment of a trained petrographer 

 and chemist with the rank and pay of a geoktgist. This proposal having been 

 sanctioned by the Treasury, ilr. J. J. II. Teall, whose published work lias placed 

 him in the very front of English Petrography, was appointed on 20th June, 1888. 

 I arranged that he should have charge of the determination of the schistose rocks of 

 the Highlands, so as to be able to aid the progress of the mapping. In order to 

 make himself acquainted with the pi-actical difficulties encountered in the field-work, 

 he started at once for the field and spent some weeks with the surveyors, accom- 

 panying them in their daily explorations in the various districts of the Scottish 

 Highlands, and collecting a large series of specimens for determination in the office. 

 His time since then has been mainly occupied in the study of these specimens, and 

 in such rock -determinations as wei'e from time to time required for the guidance of 

 the mapping." ' 



Prom 1888 until his appointment as Director in 1901, Mr. Teall 

 was for the most part occupied in a detailed study of the Highland 

 rocks, but he spent a short time in mapping on the six-inch scale 

 certain areas of Lewisian Gneiss in llona and the northern part of 

 Raasay. During the earlier of these years he likewise examined and 

 reported on a considerable series of Jurassic sedimentary rocks. It 

 was hoped that he would produce in his leisure time a companion 

 volume to his British Petrography, and deal more fully than he had 

 previously done with the sedimentary rocks and the crystalline schists ; 

 but this anticipation, which he himself had cherished, has unfortunately 

 not been realized. 



Dr. Hatch retired from the Geological Survey in 1892, and in the 

 folloAving year Mr. Teall received help in the Petrographical Depart- 

 ment from Mr. (now Professor) W. W. Watts, who had been previously 

 acting as petrographer on the Irish Staff. Mr. Watts resigned in 

 1896, and in tlie following year his place was filled by the appoint- 

 ment of Dr. William Pollard as ' Geologist ' to undertake the 

 chemical work which is inseparable from the study of petrology. 



Records of the results achieved by Mr. Teall in the Petrographical 

 Department have been given in the amplified Annual Reports of 

 the Director General for the years 1892 to 1896, and later in the 

 Summary of Pro(jress for 1897 onwards. We read of his discovery 

 of Riebeckite in the granophyre of Skye (1893), of a report on rocks 

 from the Tonga Islands (1897), of his researches on Contact Meta- 

 morphism around the Ben Cruachan granite, with especial reference 

 to the Cordierite rocks containing Corundum (1898), on the volcanic 



1 Ann. Rep. of Director General of Geol. Survey for 1888, p. 257. 



