I HAD a habit of writing her, even while we were living in the same house together, whenever the matter required a written report, and she caught the habit from me. At times we carried on a long correspondence over a financial or other difficulty, though we saw each other daily, rather than talk about it.
To get things off my mind I sent notes to myself, from the office or country to the apartment, to be attended to with Alice or at my leisure.
We wrote each other regularly, generally once a day.
New York, November 15, 1901, I wrote her on my birthday:
Joy of my life, full oft for loving you
I bless my lot, that was so lucky placed.
In one of her first letters while she was still at Barnard, she says: "I have been so harassed by the Hypergeometric Series for the last few days. Though I felt I was on terms of intimacy with it, as soon as it heard I was to have an examination it began to bristle with difficulties. But now, with all modesty, I think I may say I have met the enemy and it is mine.
"In case it should have slipped your memory, I will tell you it looks like this: