38 THE CANADIAN NATURALIST. [Vol. viii. 



an area of between 3,000 and 4,000 square miles. Most of the 

 year, however, was devoted to the collection of specimens for the 

 London Exhibition of 1851, at which Mr. Logan acted as Juror. 

 His visit to England at this time must have been for him an 

 agreeable chaDge. After a lapse of eight years to meet again 

 with men like De la Beche, MurchisoD, and Lyell, to hear from 

 their own lips of the strides which science had beeu making, and 

 in turn to tell of all that he had himself seen and done; surely 

 this was a treat that none but the scientific man can understand 

 who has long been well-nigh deprived of the society of brother 

 scientists. For him, however, there was little relaxation from 

 labour, for he toiled early and late in order that the Canadian 

 minerals might be displayed to the best advantage. And every 

 one knows the result — the collection elicited univeral admiration, 

 and Mr. Logan received a highly complimentary letter of thanks 

 from the Prince Consort, and was elected a Fellow of the Royal 

 Society, his name having been proposed by Sir Roderick Mur- 

 chison. 



Returning to Canada in August, before the close of the Ex- 

 hibition, his explorations were renewed with undiminished vigour, 

 and the remainder of the season devoted to an examination of 

 the rocks in the county of Beauharnois, where the Potsdam sand- 

 stones had afforded those curious tracks of crustaceans to which 

 Owen gave the name of Protichnites, and to a further study of 

 the Chaudiere gold region. During the winter he again visited 

 England to attend to the distribution of a portion of the Exhi- 

 bition collection which was to be left there, and see to the return 

 of the remainder. 



In 1852 an examination was made of a strip of country on 

 the north side of the St. Lawrence, extending from Montreal to 

 Cape Tourmente below Quebec. The distribution of the fossil- 

 iferous rocks was accurately determined, and several excursions 

 made into the hilly " metamorphic country " to the north. In 

 his report on this season's operations, published in 1^54, Logan 

 for the first time designated the rocks comprising these hills as the 

 " Laurentian series," substituting this for " metamorphic series," 

 the name which he had previously employed, but which, as he 

 says, is applicable to any series of rocks in an altered condition. 



The following season was spent among the Laurentian hills of 

 Grenville and the adjoining townships, a field which proved so 

 attractive that he afterwards returned to it in 1856 and 1858. 



