1867.] 



Presidenfs Address, 



179 



4. The expenditure or loss, by respiration and exhalation of the aniraal, 

 considered as a meat-producing and manure- making machine. 



It is impossible to go into detail in this portion of the inquiry, the 

 principal results of which are given in a paper published in the Philoso- 

 phical Transactions for the year 1859. 



It may be sufficient to sum up these remarks by stating that the various 

 inquiries to which a brief reference has been made, have been conducted 

 with a skill, perseverance, and success which have placed their authors, by 

 general consent, at the head of those who have pursued this important 

 branch of experimental inquiry. 



Mr. Lawes and Mr. Gilbert, 

 Receive this Medal in testimony of the Royal Society's recognition of 

 your joint labours, and of their approval of the object to which those 

 labours have been directed, — which, while not outstepping the wide limits 

 of a Society devoted to the promotion of natural knowledge, is yet in an 

 unusual degree connected with the supply of man's primary wants. It 

 will, I trust, be more especially prized by you as marking the Society's 

 high appreciation of the long devotion, the patient unbiassed desire for 

 truth, and the sound scientific manner of proceeding which have charac- 

 terized your investigations. 



The Council have awarded a Royal Medal to Sir AVilliam Logan for his 

 geological researches in Canada, and the construction of a geological map 

 of that colony. 



Sir William Logan was early known to English geologists for very meri- 

 torious work in the Coal-fields of South Wales, which was highly approved 

 at the time by the authorities of the English Geological Survey, and is un- 

 derstood to have furnished the model for similar surveys in other British 

 Coal-fields. 



In 1843 he undertook the direction of the Geological Survey of his na- 

 tive country, Canada, instituted by the Provincial Government. The re- 

 sults of this survey have been published in Annual Reports ; and a large and 

 important volume was published in 1863, condensing the whole of the 

 geological and palaeontological information which had been amassed by Sir 

 William and the assistants who acted under his direction. 



Under difficulties of which British geologists acquainted with both coun- 

 tries affirm that little idea can be formed here, he has made clear the rela- 

 tions of all the formations of Canada to each other. These consist of 

 Lower and Upper Laurentian rocks, Huronian, numerous divisions of the 

 Lower and Upper Silurian strata, and the Devonian series. Most of these 

 he correlated as far as possible with the European series and with the sub- 

 divisions described by the American geologists of the United States. 



One of the most important services that Sir W. Logan has rendered to 

 geological science was the discovery of the relations of the Laurentian rocks 

 to e.ich other and to the later formations. The^e Laurentian rocks had 



