I cannot be sure from my lecture notes just when the work Avery et al was first given in my cytogenetics course. I know that
in the 1946-47 academic year that their paper was mentioned. Proof of this is the enclosed copy of Ellen Dempsey's class
notes who took the course that year. Drew Schwartz was a member of the same class and his notes are similar to those of Dempsey.
There is no doubt in my mind that the implications of Avery et als work were fully realized by the Columbia group of biologists
in the 1940's. We had many discussions, informally to be sure, but we were aware of the significance of their studies.