Our Senior Secretary has been abroad of late, hence the delay in answering your letter. He now instructs me to say that the rules of societies differ very much as to the president's power of voting, but that it is not at all unusual for the president to have one vote as a member of the council and a second, or casting, vote by virtue of his office.
I am, yours truly,
Asst. Sec. R.S. [Assistant Secretary, Royal Society]'.