206 PATHOLOGY [BoT. Absts., Vol. VIII, 



MISCELLANEOUS (COGNATE RESEARCHES; TECHNIQUE, ETC.) 



1428. Fisher, D. F., and C. Brooks. Drouth-spot and related physiological diseases. 

 Agric. Jour. [British Columbia] 5: 290-293. 6 fig. 1920. — A paper read at the International 

 Fryit Growers' Convention, Vernon, B. C, August 1920. With typical drouth-spot Winesap 

 and Stayman were observed to be most seriously affected, followed by Gano and Ben Davis. 

 Delicious, White Pearmain, and Jonathan do not react in the same way. Although the fruit 

 may become badly shriveled no drouth-spot appears, and with the resumption of irrigation 

 the apples regain normal turgor and mature with merely a certain deficiency in size and 

 "quality." Typical drouth-spot and oozing developed on susceptible varieties before 

 shriveling and the resumption of irrigation. It must, therefore, be due to withdrawal 

 of water and not to sudden resumption of growth on addition of water. "Cork" is always 

 associated with very open or very shallow soils or those markedly deficient in humus. "Apple 

 blister" is probably due to drouth during or immediately following the blossoming period, 

 the remedy being earlier irrigation. "Punk" is a condition somewhat resembling "physio- 

 logical break-down" in storage and possibly due to intermittent drouth combined with 

 intense sunlight. A drouth-spot accompanied by copious gumming, and resulting in hard 

 bitter spots in the ripe fruit, also occurs in plums and prunes. — J. W. Eastham. 



1429. Hartley, Carl. Abnormal growth induced by chloral hydrate soil treatment. 

 Phytopath. 10:334-335. 1 fig. 1920.— Chloral hydrate (0.076 and 0.172 kgm. per sq. m.) 

 applied to the soil before sowing to Pinus ponderosa seed produced seedlings with the first 

 needles partially fastened together, as well as showing other abnormalities. — James Johnson. 



1430. Levin, Isaac, And Michael Levine. The biological and clinical evidence of the 

 therapeutic value of radium and Rontgen rays in cancer. Ann. Surgery 52:443-447. Apr., 

 1918. — In a preliminary study of the effect of Rontgen rays on normal Ricinus plants it was 

 found that no injury resulted. Ricinus plants inoculated with Bacterium tumefaciens and 

 given 6 treatments with Rontgen rays at intervals of 2 days for a period of 2 weeks showed 

 no evidence of infection after 4 weeks, or developed only a minute swelling at the point of 

 inoculation. These minute swellings consisted of typical tumor cells of arrested develop- 

 ment. Control plants inoculated from the same sub-culture developed large galls in 4 weeks. 

 The results of these experiments are cited as proof that the effect of Rontgen rays on malig- 

 nant tumors is an inhibition of the proliferating power of the tumor cells and not their destruc- 

 tion. The therapeutic value of the X-ray treatment before and after operation for cancer is 

 pointed out. — R. Nelson. 



1431. Levine, Max. Notes on Bact. coli and Bact. aerogenes. Amer. Jour. Public 

 Health 11:21-23. 1921. — It is reported that in making counts of Bacterium aerogenes the 

 growth of B. coli can be repressed by suitable concentration of crystal violet or brilliant green, 

 and that lowering the concentration of peptone in the medium increases the toxicity of the 

 dyes. — C. A. Ludwig. 



1432. MacMillan, H. G. A frost injury of potatoes. Phytopath. 10:423-424. / pi. 

 1920. — Small necrotic areas less than 1 millimeter in diameter are produced on leaves of potato 

 plants. By experimental data the trouble is shown to be due to frost. — H. H. McKinney. 



1433. MacMillan, H. G., and L. P. Byars. Heat injury to beans in Colorado. Phyto- 

 path. 10: 365-367. 1 fig. 1920. — The authors report a shrunken and collapsed condition of 

 the stem of bean seedlings which occurred at the ground line. The root systems were found 

 healthy and well developed. No organism was found associated with the affected parts. 

 Meteorological records indicated an air temperature range from 28° F. on June 3 to 104° F. 

 on June 29. The soil temperature 1 inch below the surface registered 113° F. on the latter 

 date. The authors consider the condition described to have arisen from high temperature. — 

 W. B. Tisdale. 



