To J. N. Hegt   18 December 1868

Dear Sir

I thank you for y^r letter of Dec 11^th & for your great kindness in informing me about the development of the spurs in the 2 species of Pavo.¹ If in the course of the winter or spring you sh^d perceive any difference in their rate of development, I sh^d esteem it a singular favour if you wd inform me, as I have no other means of ascertaining the point.

With sincere thanks & respect | I remain dear Sir | yours faithfully | Charles Darwin