THE HISTORY OF A DISCOYEEY. 



43 



cell- wall, wliicli I liad 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 



'^nwpfi' 



nitl'linfriTii 



llfiJ:)li|J:|:tei';fl|l|| I ,1 



i! 



a I \\ 



'ii 



m 





Fig. 11. Portion of Eozoon magnified 100 diameters, shoiving 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 

 Popular Science Monthly. 



