TO 



SIR WILLIAM JACKSON HOOKER, K.H., LL.D., 



DIRECTOR OF THE ROYAL BOTANIC GARDENS OE KEW, 

 AND 



DR. JOSEPH D ALTON HOOKER, F.R.S., 



ASSISTANT-DIRECTOR OE THE ROYAL BOTANIC GARDENS OE KEW, 



THIS HUMBLE AND 

 FIRST ATTEMPT TO POPULARIZE THE STUDY OF 



Brtttsfj %MftM 



IS, WITH MUCH EESPECT AND ESTEEM, DEDICATED 

 BY 



THE AUTHOR. 



