30 MEMOIR OF 



He studied the Zoology of North America, both existing 

 and fossil, and favoured us with an interesting and ex- 

 tended history of all its own quadrupeds, embracing a 

 great variety of new observations. 



Such were the labours of the deceased, during the 

 seven years that he resided in Philadelphia and New 

 York. For the whole of that period, his life was one of 

 unmitigated toil. As far back as November, 1823, he 

 writes to his friend Dr. Best, 



" Whatever you may think of my long continued 

 silence, it has been unavoidably produced by the inces- 

 sant and laborious employments which have occupied the 

 whole of my time." 



In 1824, he writes to another friend 

 " My time has been very much occupied in the various 

 duties which devolve on me here, and I am obliged to 

 neglect my friends, in appearance, because it is out of my 

 power to bestow the necessary attention to correspond- 

 ence." 



Again, in 1825, he says to the same 

 " It is needless to tell you, that I am excessively occu- 

 pied, and shall be more so as the winter approaches." 



In the next year we find him still in the same condi- 

 tion 



" If you expect news at my hands," says he to Dr. 

 Best, " you expect in vain. My life is one monotonous 

 round of incessant toil after bread and/ame, that ' certain 

 portion of uncertain paper.' Of my success in the bread 



