[pBNHALLow] NOTES ON TERTIARY PLANTS 78 



Tilia americana, L. 



The oammon basswood is represented by two fragments of leaves 

 only, but it is a well-known constituent of the Don flora. 



TJlmus americana, L. 



The American elm is represented in the present instance by a i&w 

 fragments only, but it has been recognized frequently on former occa- 

 sions, and no doubt formed a prominent feature of the Don flora. 



Logan's Brickyard. 



All of the specimens from Logan's Brickj'^ard were represented by 

 fragments of wood, the majority of wliich were in an excellent state 

 of preservation without silicification, and permitted of determination 

 without difficulty, except in one case where decay had operated exten- 

 gively. All the specimens gave evidence of prolonged immersion in 

 water, and a few were very strongly macerated. Only two genera and 

 two species were found, as followsi: — 



Larix americana, Michx. 



The common larch was represented by four specimens, or 33.3% 

 of the entire collection. In most cases the structure was well pre- 

 served, a feature comimonly observed in Larix when associated genera 

 may be greatly altered, and in one instance the long, thin splinter of 

 wood showed the efl;ect of fire, indicating the result of a forest fire. 

 T!he occurrence of this species indicates nothing of special note, since 

 it is a well-known element of the Pleistocene flora of both the Don 

 and Scarborough periods, and its excessive range in latitude does not 

 afford any special index of climatic conditions. 



Picea nigra, Link. 



The bulk of the material from Logan"s. Iîrick3'ard consisted of 

 fragments of branches of the common black spruce, which could be 

 identified without difficulty, although in one case with an element of 

 doubt, on account of the advanced condition of decay which it pre- 

 sented. The great abundance of this species, amounting to 66.6% of 



