We have been informed that you have contrived some improved form of the lantern-microscope for demonstration in the lecture-room. We are anxious to get something of the kind for use with our electric lantern at the meetings of the Society. Will you inform us to what maker we ought to apply for particulars of construction and price of your instrument.
I am, Dear Sir, very truly yours
Asst. Secy R.S. [Assistant Secretary, Royal Society]'.