BOTANIC GARDENS. 



contains the famous herbarium and library in which Asa Gray 

 accomplished his work on the plants of North America. The main 

 laboratories and museums are located in the university buildings. 



Some very important work on the morphology of the cryptogams 

 has been published from these laboratories. The Arnold Arbore- 

 tum of Harvard University is organized entirely independent of 

 the botanic garden. It includes an area of two hundred and fifty 

 acres, of which one hundred and sixty are planted with trees and 



