"Dear Doctor Isaacson:
"My health," etc., etc.
He opened another:
"200, Park Lane, Jan. ——
"Dear Doctor Isaacson:
"I don't know what is the matter with me, but—" etc., etc.
He took up a third:
"1x, Berkeley Square, Jan. ——
"Dear Doctor Isaacson:
"That strange feeling in my head has returned, and I should like to see you about it," etc., etc.