The present study of the production and properties of an antibiotic was undertaken in the hope that some useful information could be contributed to a long-range investigation program being carried on at North Texas State Teachers College. This program is concerned with the production of a useful antibiotic from a variant of the Penicillium notatum-chysogenum group of molds.

It is the purpose of this paper to present data on the isolation and study of the chemical nature of compounds produced by this strain of mold which resembles Penicillium notatum nestling.