No. 1, August, 1920] PHYSIOLOGY 137 



or other suitable electrolyte is mixed with the soil, or the ground is well watered with the min- 

 eral in solution, much of the water ordinarily required by plant life may be dispensed with. 

 Potted plants so treated were kept alive in a warm greenhouse, exposed to the sun's rays, for 

 three months without water. When vegetable life is said to be "resting" during the late 

 autumn and winter months, it is probably due to lowered electrification. — Chas. II. Olis. 



PHYSIOLOGY OF DISEASES 



969. Anonymous. Disease resistance in plants. Gard. Chron. 65: 192. 1919. — This 

 editorial is a popular consideration of the phenomenon of resistance in varieties of plants, 

 suggesting briefly an explanation based on the presence and absence of certain chemical 

 factors. The author suggests that the present status of the mechanism of immunity in ani- 

 mals may be a source of encouragement to plant pathologists. — C. R. Hursh. 



970. Paine, Sydney G., and H. Stansfield. Studies in Bacteriosis. III. — A bacterial 

 leaf-spot disease of Pro tea cynaroides, exhibiting a host reaction of possibly bacteriolytic nature. 

 Ann. Appl. Biol. 6: 27-29. PI. 2, fig. 3-6. 1919.— See Bot. Absts. 5, Entry 757. 



971. Rose, D. H. Infection as related to humidity and temperature. [Rev. of: Laurit- 

 zen, J. T. The relation of temperature and humidity to infection by certain fungi. Phyto- 

 path. 9: 1-35. 1919.] Bot. Gaz. 68: 66-67. 1919. 



MISCELLANEOUS 



972. Anders, J. N. Growing plants as health-giving agents. Sci. Monthly 10: 63-69. 

 1920. — This is a popular presentation of the subject. — L. Pace. 



973. Bobilioff, W. De inwendige bouw der schorselementen ven Hevea brasiliensis. 

 [The structure of cell elements in the bark of Hevea brasiliensis.] Arch. Rubbercult. Neder- 

 landsch-Indie 3 : 222-231. 1919— See Bot. Absts. 5, Entry 546. 



974. Gagnespain, F. Vegetable "plethora." Sci. Amer. Supplem. 88: 220, 232. 1 fig. 

 1919. [Translated from La Rousse Mensuel (Paris), April, 1919.] — Results of "over-feeding" 

 of plants and differences in habitat between individuals of the same species. — Chas. H. Otis. 



975. Glover, G. H., T. E. Newson, and W. W. Robbins. A new poisonous plant, the 

 whorled milkweed Asclepias verticillata. Colorado Agric. Exp. Sta. Bull. 246. 16 p. IS fig. 

 1918. — Serious losses of stock particularly sheep, are reported from southwestern Colorado 

 due to Asclepias verticillata. The plant appears to be poisonous at all stages of growth and 

 when dry. The symptoms of the affected animals are described. Death may result within 

 S hours. The poisonous compound was not identified. — C. R. Hursh. 



976. Harvey, R. B. A thermo regulator with the characteristics of the Beckman ther- 

 mometer. Jour. Biol. Chem. 41 : 9-10. PI. 1. 1920. 



977. Hibbard, R. P. Preparation of seed potatoes. [Rev. of : Appleman, C. O. Physio- 

 logical basis for the preparation of potatoes for seed. Maryland Agric. Exp. Sta. Bull. 212: 

 79-102. Fig. 1-11. 1918.] Plant World 22 : 91-92. 1919. 



978. Nagel. Kartoffellagerungsversuche. [Potato storage experiments.] Illustrierte 

 Landw. Zeitg. 39: 6. 1919.— See Bot. Absts. 5, Entry 46. 



979. Weimer, J. L. Some observations on the spore discharge of Pleurage curvicolla 

 (Wint) Kuntze. Amer. Jour. Bot. 7: 75-77. 1920.— See Bot. Absts. 5, Entry 695. 



