No. 2, June, 1921] PATHOLOGY 197 



1364. Snell, W. H. Observations on the distance of spread of aeciospores and uredinio- 

 spores of Cronartium ribicola. Phytopath. 10:358-364. 1920.— The writer records field 

 observations in Wisconsin and New York on natural infections of pine and Ribes. He con- 

 cludes that aeciospores can be blown more than U miles to infect Ribes. Dry weather in 

 New York prevented a wide distribution of the disease by urediniospores. — C. J. Humphrey. 



1365. TxTBEtJF, C. VON. [Rev. of: Clinton, G. P., and Florence A. McCobmick. 

 Infection experiments of Pinus strobus with Cronartium ribicola. Connecticut (New Haven) 

 Agric. Exp. Sta. Bull. 214. 438-459, pi. 37-4S. 1916-1918 (see Bot. Absts. 6, Entry 225).] 

 Naturw. Zeitschr. Forst- u. Landw. 18: 236-237. 1920.— The reviewer calls attention to his 

 previous contributions on the same subject. He briefly reviews and criticizes the authors' 

 conclusions on the methods of attack of the fungus, and its external manifestations on the 

 foliage. — J. Roeser. 



1366. Walker, J. C, and W. B. Tisdale. Observations on the seed transmission of the 

 cabbage black rot organism. Phytopath. IQ: 174-177. 1920.— A large percentage of cabbage 

 plants grown from imported seed developed black rot (Bacterium campestre) . When seed 

 of the same lot was treated with mercuric chloride, the disease was practically eliminated. — 

 S. P. Doolittle. 



THE HOST (RESISTANCE, SUSCEPTIBILITY; MORBID ANATOMY AND 



PHYSIOLOGY) 



1367. Artschwager, Ernst F. Pathological anatomy of potato blackleg. Jour. Agric. 

 Res. 20:325-330. PI. 57-58. 1920 [1921].— Material for study was taken in arid part of 

 Colorado, U. S. A. Plants affected with black leg show an increase in strongly lignified 

 vascular tissue and a transformation of most of the parenchyma cells of cortex and pith into 

 sclereids. Protein crystals occur in the cells of leaves of affected plants; in healthy plants 

 they have been observed only in peripheral cells of the cortex in tubers. — D. Reddick. 



1368. Collins, J. Franklin. Notes on the resistance of chestnut to blight. Phytopath. 

 10:368-371. 2 fig. 1920.— Results of observations indicate that the American chestnut 

 (Castanea dentata) is developing resistance to blight. The author describes a case in which 

 a young chestnut shoot apparently recovered from the disease. — Ruth G. Bitterman. 



1369. Colon, E. D. The absorption spectrum of the chlorophyll in yellow-striped sugar- 

 cane. Jour. Dept. Agric. Porto Rico 3^:4.3-46. 1919 [1920].— Leaves from healthy plants 

 and from plants affected with mosaic were used. The absorption spectra from alcoholic 

 solutions of chlorophyll from the two kinds of leaves were alike. "Although the tests above 

 described were not as numerous nor performed with as many solvents as might have been 

 desirable, they warrant the belief that the disappearance of the pigment in yellow-stripe is 

 not primarily due to a decomposition of chlorophyll as such." — D. Reddick. 



1370. Earle,.F. S. The years experience with sugar-cane mosaic or stripe disease. 

 Jour. Dept. Agric. Porto Rico 3^:3-33. 1919 [1920].— An account is given of the lines of 

 activity in Porto Rico since October, 1918, in the study of mosaic. An historical r^sum6 of 

 previous work, with comments upon the researches presented in the same journal by others, 

 is presented. In some cases the comments are more specific or more detailed than those 

 presented by the authors. [See Bot. Absts. 8, Entries 1345, 1356, 1361, 1369, 1378.]— Z). 

 Reddick. 



1371. Edson, H. a. Vascular discoloration of Irish potato tubers. Jour. Agric. Res. 20: 

 277-294. 1920 [1921].— Vascular discoloration of stem-end tissues of Irish potato tubers is 

 not proof of the presence of parasitic fungi. Discolored bundles often are sterile and fungi 

 frequently are isolated from tissues which appear normal. — Out of 3,203 attempts, by plat- 

 ing, to isolate fungi from tubers, all but 161 of which were discolored, 1,352 gave no growth. 



