To L. C. Harrison 18 October 
My dear Lucy
I am very sorry but I really can think of no suggestion to send to Mrs. Forsyth. It is difficult to observe anything new & requires much patience. I believe that the observer must first himself or herself become interested on the point or subject. The best plan is to read, think & speculate, & then some suggestion or doubt will occur, which can be determined or verified only by observation. I can do nothing but send them common-places.
Your affect. Uncle | Ch. Darwin
Can think of no suggestion to send to Mrs Forsyth. "The best plan is to read, think and speculate and then some suggestion or doubt will occur which can be determined or verified out of observation."
Please cite as
Darwin Correspondence Project, “Letter no. 13414,” accessed on 21 February 2017, http://www.darwinproject.ac.uk/DCP-LETT-13414