32 THE CANADIAN NATURALIST. [Vol. viii. 



mining and metallurgy, which afterwards proved of the greatest 

 value to him, but had done a large amount of very excellent 

 geological work — work which caused Dr. Buckland, of Oxford, 

 to say of him, '-'He is the most skilful geological surveyor of a 

 coal-field I have ever known." During his stay at Swansea, he 

 was an active worker for the interests of the lioyal Institution 

 of South Wales. He was Honorary Secretary and Curator of the 

 geological department, and the Institution is indebted to him 

 for valuable collections of minerals and metallurgic al products, 

 besides books, drawings and laboratory apparatus. The whole of 

 his geological work in South Wales he placed gratuitously at the 

 disposal of the Ordnance Geological Survey of Great Britain, 

 aud it was not only gladly accepted, but published "without 

 alteration," and made the basis of future w T ork in that region. 

 Concerning it, Sir H. T. De la Beche afterwards wrote as 

 follows : 



" Prior to the appearance of the Geological Survey in that 

 part of the country, Mr. W. E. Logan had carefully investigated 

 it, and at the meeting of the British Association for the Ad- 

 vancement of Science, held at Liverpool in 1837, he exhibited a 

 beautifully executed map of it. 



" The work on this District being of an order so greatly supe- 

 rior to that usual with geologists, and corresponding in the 

 minuteness and accuracy of its detail, with the mips and sections 

 executed by the Ordnance Geological Survey, we felt desirous of 

 availing ourselves of it, w T hen Mr. Logan most handsomely 

 placed it at our disposal. Having verified this work with great 

 care, we find it so excellent that we shall adopt it for that part 

 of the country to which it relates, considering it but fair and 

 proper that Mr. Logan should obtain that credit to which his 

 labours so justly entitle him. 



" His sections are all levelled and measured carefully with 

 proper instruments, and his maps are executed with a precision 

 only as yet employed, except in his case, on the Ordnance Geo- 

 logical Survey ; it being considered essential on that survey, for 

 the right progress of geology, and the applications to the useful 

 purposes of life, that this accuracy and precision should be 

 attained." 



In 18-40, Logan read a paper before the Geological Society of 

 London, in which he explained, for the first time, the true rela- 

 tion of the Stigmaria uuderclays to the i vei lying beds of coal, 



