Ostobsr ll, 1y46.

Dear Ir. wykott, |

Pyease oblige me by placing my name on your mailing lis
Yor your publications on the electron-micrograpiy of the bac-
terial viruses; and of bacteria.

May I suggest that it would be of great mnterest to examine,
by your methods, cultures of sogenic Salmonella. I have been
surprised to observe with some lysogenic §,. typhimuriuin ( active
on S. gailinarum) that the phage could not ve eliminated even
inethe bacterial survivors of heavy ultraviolet trestnent, It
would 6@ important to detexmine, af possible, tie nusiter of pars
tiokes ia Such 6ells.

Your: sinverely,

- Joshua Léeverherg,
Ascistent Professer of Genetias.