THE HISTORY OF A DISCOVERY. 



43 



cell-wall, which I had not observed previously through 

 a curious accident as to specimens.* Mr. Lowe had 

 been sent back to the Ottawa to explore, and just be- 

 fore Sir William^s departure had sent in some speci- 

 mens from a new locality at Petite Nation, similar in 

 general appearance to those from Grenville, which Sir 



Fig. 11. Portion of Eozoon magnified 100 diameters, showing the 

 original Cell-wall with Tuhulation, and the Supplemental Skeleton 

 with Canals, {After Carpenter.) 



' (o.) Original tubulated wall or " Nummuline layer," more magnified in fig. 2. 

 (b, c.) " Intermediate skeleton," with canals. 



William took with him unsliced to England. These 

 showed in a perfect manner the tubuli of the primary 

 cell- wall, which I had in vain tried to resolve in the 



* In papers by Dr. Carpenter, subsequently referred to. 

 Prof. Jones published an able exposition of the facts in the 

 Tojpular Science Monthly. 



