Double Marker Transformations as Evidence of Linked Factors in Desoxyribonucleate Transforming Agents.

pneumococci. The degree to which discontinuous oxygen shock can replace or modify the effect of temperature as a conditioning agent is under investigation. Sumnmary.-The transformability of pneumococcal cultures appears to be the result of cyclical processes occurring in individual groups in the population. These cycles, and the somewhat more regular ones of cell division to which they may be related, can both be accentuated and apparently rendered more synchronous, by the conditioning effect of appropriate environmental change.