WILLIAM COOPER 



and that of his family induced him to leave 

 New York for a country life on his farm in 

 New Jersey, on the banks of the Hudson, 

 now the site of the village of Guttenberg. 

 The same year the Lyceum published his first 

 monograph relating to New York zoology, 

 and two papers on species of bats found be- 

 yond the limits of the State. 9 10 " 



The investigation of this, one of the most 

 difficult orders of the class Mammalia, was 

 made first in accordance with the scientific 

 classification then prevailing ; and though col- 

 lecting much towards a continuation of the sub- 

 ject, he never published more in his own name. 



He was offered the pleasant and profitable 

 employment of preparing the Zoology for the 

 great work on the Natural History of New 

 York, but feeling that he could not do justice 

 to the subject, not being in sound health, and 



9 Description of five species of Vespertilio that inhabit the 

 environs of the city of New York. 



10 On two species of Molossus inhabiting the Southern United 

 States. 



11 On two species of Plecotus inhabiting the United States 

 Territories. 



(Reprinted as " Researches on the Cheiroptera.") 



