I am directed to acknowledge the receipt of your letter of the 5th inst. [instant], and to say that it gives hardly enough detail to enable any definite opinion to be formed on the subject mentioned therein. In all probability the phenomena is a well understood one, but, if you should wish to make any further communication on the matter, it must be in the ordinary way, namely, through a Fellow of the Society.
I am, yours faithfully,
Asst. Sec. R.S. [Assistant Secretary, Royal Society]'.