74 ROYAL SOCIETY OF CANADA 



of numerous resin cells, it was found impossible to carry the determina- 

 tion further than to ascertain that the wood is probably that of 

 Juniperus, in which case it would in all probability be that of J. vir- 

 giniana. 



Picea nigra, Link. 



Specimens 2 and 3 from the Don. Valley Brickj'^ard were found to 

 be devoid of silicification, but much altered by the effects of extreme 

 decay. They clearly represent the wood of Picea, ,and in all probability 

 of P. nigra. 



i 



Populus balsamifera, L. 



Two specimens of leaves represent this specie?, which has hitherto 

 been found somewhat abundantly in the deposits of both the Don period 

 and the Greenes Creek period. 



Quercus alba, L. 



A specimen of wood marked Ko. 1, from the Don. Valley Brickyard, 

 was characterized by its hardness, due in part to silicification. The 

 specimen yielded to the action of hot sodium carbonate, and proved to 

 be a species of Quercus much altered by extreme decay and compression, 

 in consequence of which it was impossible to determine the species 

 which may be any one of seven previously noted from the same deposits. 

 On account of the associated leaves and certain stru-ctural features, it 

 may be pro visioD ally assigned to Q. alba. Fro'm the same deposits a 

 large number of leaves were obtained. These amounted to eleven 

 specimens in all, or 16.9% of the entire colkction, and could be referred 

 to the same species without difficulty. 



Quercus niacrocarpa, Michx. 



Mingled with the former wore several characteristic leaf fragments 

 of the Bur Oak, which have similarly been found in previous collections 

 from the Pleistocene of the Don period. 



Quercus tinctoria, Bart. 



This tree, also common to the deposits of the Don period, was 

 represented in the present instance by a few fragments only. 



