Mr. Hershey: How long?
Dr. Zimmerman: This is not the oak that I had reference to when you were up there. These are about three years old. I think they grow a little better than on the chestnut. Many of them died. I have another scheme now; that is grafting the scions as high as I can. Get them united and then bend them over and get them to root. Some are doing nicely, others have died.
Dr. Smith. I think you complimented us by thinking we could follow you. Do you intend to vaccinate the chestnut and make it immune and then expect it to transmit that immunity in its seed? Have you checked up in the second generation?
Dr. Zimmerman: I haven't had time yet.
Dr. Smith: Thus far you have established immunity in the living tree?
Dr. Zimmerman: Yes, and I have a bunch of seedlings now from nuts from immunized trees that I planted last spring. I have 200 of those. I expect them to inherit immunization from their parents.
Dr. Smith: We vaccinate each generation of youngsters.
Dr. Zimmerman: I was speaking of the experiments with guinea pigs.
Dr. Smith: Isn't smallpox vaccination against your theory?
Dr. Zimmerman: I don't think so. They are doing it with other things. I found a human being giving the reaction for typhoid for seventeen years after he had been immunized.