No. 1, Mat, 1921] HORTICULTURE 59 



378. CoviLLE, Frederick V. The influence of cold in stimulating the growth of plants. 

 Jour. Agric. Res. 22: 151-160. PI. 20-35. 1920.— Such woody plants as the blueberry taken 

 into a warm greenhouse in autumn refused to grow, although plants left out in the cold through 

 the winter grew at once on being taken into such a greenhouse. A single freezing would not 

 cause them to grow, but a prolonged chilling, even above the freezing point, would do so. When 

 only a portion of the plant was chilled, that portion only started into growth on being 

 brought into a warm room. The author thinks that "during the process of chilling the starch 

 grains stored in the cells of the plant are at first separated by the living and active cell mem- 

 branes from the enzyme that would transform the starch into sugar, but when the plant is 

 chilled the vital activity of the cell membrane is weakened so that the enzyme 'leaks' through 

 it, comes in contact with the starch, and turns it into sugar." He thinks that when the 

 plant finally starts to grow without having been chilled the same principle applies, the mem- 

 brane separating starch from the enzyme being weakened. The same principle is believed to 

 apply when seeds are benefited by stratification. — W. H. Chandler. 



379. Demaree, J. B. Some precautions in top-working pecan trees. Amer. Nut Jour, 

 13 : 74. 1920. — Several reasons are given for preferring coal tar for sealing up wounds. An 

 admixture of creosote is recommended because of its greater penetrating and antiseptic prop- 

 erties. Applications should be repeated after two or three months, and as frequently there- 

 after as may seem necessary. — E. L. Overholser. 



380. Deming, W. C. Plant black walnut. Amer. Nut Jour. 13: 10. 1920.— The author 

 takes exception to Bley's statement and advocates the planting of black walnut along road- 

 sides. — E. L. Overholser. 



381. Edwards, C. L, Selling standard pecans. Amer. Nut Jour. 12: 27. 1920. 



382. Edwards, C. L. Transforming native to cultivated pecans in Texas. A.mer, Nut 

 Jour. 12:9, 13. 1920. 



383. Forkett, C. Pecan breeding. Amer. Nut Jour. 12: 69. 1920. — A report on cross- 

 ing Columbian, Success, Russel, Schley and Pabst varieties. Since most of the trees have not 

 come into bearing no definite results are given. — E. L. Overholser. 



384. GiMiNGHAM, C. T., AND O. Grove. Trial cider orchards. Ann. Kept. Agric. and 

 Hort. Res. Sta. Univ. Bristol 1919:99-109. 1919. — A description of conditions and treat- 

 ments in some trial orchards in Devon, Gloucester, Monmouth, and Somerset Counties. — 

 W. H. Chandler: 



385. Hoover, M. H. The farms by the side of the road. Amer. Nut Jour. 13: 38-39, 46. 

 1920. — Economic and conservation considerations emphasize the unrealized national asset of 

 nut trees planted along roadsides. — E. L. Overholser. 



386. Howard, H. L. More about root stocks. Monthly Bull. Dept. Agric. California 9: 

 93-95. 1920. — The French prune makes very poor union with the apricot root. Japanese 

 pear stock is more resistant to pear blight than the French stock and successfully resists 

 attack of woolly aphis. Some of the Siberian seedlings give great promise as regards blight 

 resistance. By bench-grafting long scions of Surprise pear on Japanese roots the trunks 

 and bases of main branches are obtained blight resistant. — E. L. Overholser. 



387. IsBELL, C. L. Pecans on Piedmont soil in Alabama [U. S. A.]. Amer. Nut Jour. 13: 

 69. 1920. 



388. Jones, J. F. Pecans, other than those of the well-known sections. Amer. Nut Jour. 

 12: 25, 30. 1920. — In its natural range the pecan is found farther north along the Mississippi 

 in Iowa and Illinois than elsewhere in the U. S. A. Best varieties, like Marquardt and Witte, 



