See below for the original letter and related photograph. In the letter, the folds indicate that it was carried in Yashiro's pocket.
Via Vincigliata, Florence, Dec. 28, 57
My dear Yashiro,
I have just heard from Katherine Dunham.
She writes that you are far from well, and that your dear wife is very anxious about your health.
I share her feelings, but I implore you not to give up hope. The will to live and get well can still perform miracles.
Two years ago the doctors gave me up and were so sure that I was dying that my bed-room was crowded with devoted friends and dependents to give me a last salute. I would not die. I insisted on living, and I am still alive altho’ now nearly 93 years old.
Live and come here to do the new edition of your true and beautiful book on Botticelli.
With respectful greetings to your wife,