Sporulation of putrefactive anaerobe 3679h was studied by observation of ultrathin sections in the electron microscope. The customary stages were observed during forespore formation, spore maturation, and liberation of the free spore. The exosporium was partially laminated and devoid of the hairlike surface projections observed on spores of some species. Atypical membrane configurations occurred in some cells, and, occasionally, cells with bipolar forespores were found.

Several properties of psychrophilic pseudomonads were studied with cells grown in batch culture in nutrient broth at 2 and 30 C. No differences were observed in the size, catalase activity, deoxyribonucleic acid, ribonucleic acid, or protein content of cells grown at either temperature. The importance of comparing physiologically similar cells is discussed. 'Journal Series No.

Several properties of psychrophilic pseudomonads were studied with cells grown in batch culture in nutrient broth at 2 and 30 C. No differences were observed in the size, catalase activity, deoxyribonucleic acid, ribonucleic acid, or protein content of cells grown at either temperature. The importance of comparing physiologically similar cells is discussed.