ROBERT WARING DARWIN, 
M.D.&F.R.S. 
As the Science of BOTANY has 
always been intimately connected with the Science 
of MEDICINE, I make no Apology for taking 
the Liberty of addressing this third Edition of the 
PRINCIPIA BGTANICA to one so eminent in 
his Profession. It also indicates a jiist Tribute to 
his Abilities and Merit-; and a sincere Testimony 
of the high Esteem and Regard of his truly 
affectionate Uncle, 
Robert Waring Darwin. 
