338 POWER OF MOVEMENT IN PLANTS. [l88l. 



at the difference in our conclusions ; but I could not fully 

 understand some parts which my son Francis will be able to 

 translate to me when he returns home. The greater part of 

 your book is beautifully clear. 



Finally, I wish that I had enough strength and spirit to 

 commence a fresh set of experiments, and publish the results, 

 with a full recantation of my errors when convinced of them ; 

 but I am too old for such an undertaking, nor do I suppose 

 that I shall be able to do much, or any more, original work. 

 I imagine that I see one possible source of error in your 

 beautiful experiment of a plant rotating and exposed to a 

 lateral light. 



With high respect and with sincere thanks for the kind 

 manner in which you have treated me and my mistakes, I 

 remain. 



My dear Sir, yours sincerely, 



CHARLES DARWIN. 



