June, 1920] PHYSIOLOGY 423 



Guthkie who had shown that the increase of the amyloclastic activity of papain with harley 

 meal is not manifested when the infusion is kept in direct contact with tlie proteoclastic 

 ferments. The yeast infusions were obtained from yeast prepared according to the Lebedeff 

 method. — The addition of papain to yeast juice destroyed the catalase and zymase. In the 

 state of zymogens there was shown greater stability and resistance to the factors of inactiva- 

 tion. The hefanol extract of yeast in the presence of antiseptics showed a measurable degree 

 of inverting activity. This inverting agent was amylase. — The diastase and papain bad DO 

 influence upon the hefanol infusion even after a digestion of 21 hours. < )b ervation is made 

 upon the intensity of autofermentation. After the latter there remains some amylase which 

 is sensitive to papain. This sensitiveness is expressed by the data showing the decrease of 

 the per cent of sugar inverted from 25.6 to 19 when papain was added. — Certain cellular ma- 

 terials, as soluble or incoagulable protoplasmic products, decreased the activity of sucrase 

 according to the concentration. In the presence of small quantities of these substances the 

 rapidity of hydrolysis of saccharose is hardly modified. Extracts of yeasts, inactivated by 

 acetone, give a notable increase of inverting power when added to a solution of papain or 

 active amylase, the yeast cells in this respect behaving like cellular bodies. The above in- 

 crease is due on the one hand to the increase of sucrase and on the other to the decrease of 

 cellular substance into the digestion products. — A. M. Gurjar. 



2883. Waksman, Selman A. Studies in the metabolism of Actinomycetes. [I.] Jour. 

 Bact. 4: 1S9-216. 1919. — Forty-two different species of Actinomyces, many of which were 

 isolated from the soil, were used in the investigation. These were grown on three different 

 culture media: milk, blood agar, and Lcoffler's blood serum. The greatest variation in 

 the characters of the different species occurred in milk, the author being able to divide the 

 species tested into five groups depending upon the coagulation of the casein in milk and the 

 peptonization of the coagulum. Several tests were made and the conclusion reached that 

 two different enzymes were operative in bringing about these reactions, — a rennet-like 

 enzyme and a proteolytic enzyme. When the organism was grown in Czapek's synthetic 

 solution the rennet-like enzyme appeared to be dissolved out into the medium, while the 

 proteolytic enzyme was kept largely within the mycelium of the organism. Hemolysis on 

 the blood agar and liquefication of the coagulated blood serum were brought about by species 

 which produced the proteolytic enzyme. [See also Bot. Absts. 3, Entry 2860.] — Chester A. 

 Darling. 



METABOLISM (RESPIRATION) 



2884. Butler, O. Effect of wounds on loss of weight of potatoes. Jour. Amer. Soc. 

 Agron. 2:304-305. 1919.— See Bot. Absts. 3, Entry 1861. 



ORGANISM AS A WHOLE 



2885. Det, P. K. Studies in the physiology of parasitism. V. Infection by Colleto- 

 trichum Lindemuthianum. Ann. Bot. 33: 305-312. PI. 12. 1919.— See Bot. Absts. 3, Entry 

 2618. 



2886. Haas, A. R. C., and E. B. Fred. Effect of soybean germination upon the growth of 

 its nodule-forming bacteria. Soil Sci. 7:237-245. 1 pi., 2 fig. 1919.— See Bot. Absts. 3, 

 Entry 2936. 



2887. Lohr, P. J. Untersuchungen iiber die Blattanatomie von Alpen-und Ebenenpflan- 

 zen. [Investigations on the leaf anatomy of alpine and prairie plants.] Rec. Trav. Bot. Neer- 

 land. 16: 1-62. Fig. la-J£b (8), tab. 1919. -See Bot. Absts. 4, Entry 240. 



2888. McAtee, W. L. Summary of notes on winter blooming at Washington, D. C. Proc. 

 Washington [D. C.] Biol. Soc. 32: 129-132. 1919. -See Bot, Absts. 4, Entry 246. 



