THE BRIAN OR DEVONIAN FORESTS. 



49 



flora, which I was then preparing, and which was pub- 

 lished in 1871, tinder the name Sporangites Huronensis. 

 In 1871, having occasion to write a communication to 

 the "American Journal of Science" on the question then 



Fio. 



raised as to the share of spores and spore-cases in the ac- 

 cumulation of coal, a question to be discussed in a sub- 



