472 Canadian Record of Science. 



still older Grenville Series was of a character more indica- 

 tive of long-continued quiescence, accompanied by the 

 accumulation of great calcareous deposits, possibly of 

 organic origin. 



These conclusions were noticed in papers contributed to 

 local societies, in published lecture-notes, and in class- 

 teaching, and were frequently discussed with Logan and 

 Hunt. Accordingly, when, in 1863, at the urgent request 

 of Logan, I undertook the microscopic examination of 

 large series of his supposed Laurentian fossils and the con- 

 taining limestones, as well as of other crystalline limestones 

 of various ages, slices of which he had caused to be made, 

 I was not unprepared to find the curious and beautiful 

 structures which developed themselves in his Stromato- 

 poroid forms, and in portions of the limestone in which 

 they were contained, but which appeared to resemble 

 those of Foraminifera rather than those of Corals. 



The results thus attained, in 1864, were not fully pub- 

 lished until after Logan was prepared to sustain them by 

 detailed maps and sections of the district on the Ottawa 

 containing Eozoon, a work extending over many years of 

 arduous and skilful labour ; and until Dr. W. B. Carpenter 

 and Prof. Rupert Jones had studied the original specimens 

 and others prepared for themselves, along with my notes, 

 and camera drawings executed by the artist of the 

 Geological Survey. Dr. Sterry Hunt had also examined 

 chemically the serpentine and other minerals associated 

 with the supposed fossils, and various hydrous silicates 

 mineralizing organic remains in Silurian and other lime- 

 stones, as terms of comparison. The whole was then 

 communicated to the Geological Society of London, and 

 appeared in the somewhat elaborate joint paper published 

 in 1865. 1 



i A preliminary accoount entitled "On the occurrence of Organic Remains in the 

 Laurentian Rocks of Canada." had, however, been communicated to the British 

 Association at Bath, Sept. 15-21, 1S64, and was subsequently published in the Geological 

 Magazine, Vol. I, for November, 1S64, pp. 225-227. 



