Letter returned by post office.

Ts. carbon also extant.

BR thinks he has never denied being a humanist but prefers the word rationalist.

"You also ask what is the source of my passion. I do not think that passions have any source. If you saw a child drowning, you would try to save it and would not wait for some -ism to persuade you that it was worth saving. I see the human race drowning and have an equally direct impulse to save it. There is no need to justify this impulse, any more than to justify eating when one is hungry. The -isms by which people attempt to justify their impulses are, in fact, products of the impulses that they pretend to justify."