Letter from William Huggins, Upper Tulse Hill, to [William Fletcher Barrett] Thinks that Barrett's discovery is interesting and he should send a note to the Royal Society to establish priority. He cannot recall when the next meeting is, but suggests that Barrett looks for it in The Times. Gives a brief account of the topic of his lectures which may clash with Barrett's. Notes Dr Gibbs help with his spectra lines; one, sodium, appears promising. 13 December 1869