JKT. 45.] TO W. J. HOOKER. 421 



Agassiz speaks most highly of it ; but I think he 

 has only looked rapidly through its pages as yet. . . . 



I am at this moment preparing to begin the print- 

 ing of the 2d edition of my " Manual of the Botany of 

 the Northern States." . . . 



In consequence of your book, I shall take pains to 

 classify the introduced plants, according to the degree 

 of naturalization, etc. 



Many thanks for sending me your portrait. I am 

 already quite rich in the likenesses of botanists, many 

 of which adorn the walls of my apartments. . . . 



Believe me to remain, my dear friend, yours very 

 faithfully and truly, ASA GRAY. 



TO W. J. HOOKER. 



CAMBRIDGE, February 25, 1856. 



MY DEAR SIR WILLIAM, Holton is bringing 

 out a book upon New Granada which will be interest- 

 ing. . . . 



The cypress knee sent was the best and handsomest 

 I had, though not the largest. I am glad it pleases 

 you. But you mistook what I said, or meant to say, 

 which was, that tucked away in the hollow you would 

 find placed a specimen of a forming knee, not much 

 bigger than your knuckle, on a piece of root a foot or 

 so long. Was this overlooked or lost? Please tell 

 me ; for I can replace it with another, and physiolo- 

 gically it would be well to show the formation in its 

 various stages. . . . 



I want to send you a book by a young friend of 

 ours, Olmsted, on the seaboard slave States, 1 an admi- 

 rable volume, full of information, and lively withal. 



1 A. Journey in the Seaboard Slave States, with Remarks on their 

 Economy. By Frederic Law Olmsted. New York, 1856. 



