From R. S. Bartleet   15 November 1881

Dear Sir,

I have read with great interest your most interesting account of the earth worm and it’s beneficial operations on the face of the earth—¹

May I venture to enquire whether you have given any study to that little insect the gnat—²

If so would you kindly inform me whether you have discovered the cause of numbers of them playing in the air by flying up and down over the same spot for hours, there being no apparent attraction or object— I may say that for 40 years I have noticed this operation in one particular spot between some evergreen bushes over a paved foot path leading to my house— However much you may disturb them or drive them away they will return to the same position—

Again has it been ascertained on what they feed for altho fond of the juices of man but a very minute proportion can succeed in feeding in that way— Pray pardon the liberty I am taking in addressing you as a stranger, I feel sure that your sympathy with enquiring minds will induce you to accept my apology and if you happen ever to be in this neighbourhood it will afford me the greatest pleasure to see you and aid your researches in this district

I am, Dear Sir, | Yours faithfully | R. S. Bartleet | J.P. & D.L. M.S.A.³

C. Darwin Esq^r. &c.