352 HORTICULTURE [Bot. Absts. 



various countries and gives a table showing the United States orange and grapefruit supply. 

 In a review of the effect of the war on citrus production in the different countries, it is noted 

 that Palestine has been particularly hard hit, Liverpool receipts of Jaffa oranges dropping 

 from 1,000,000 cases a year to nothing. — «/. E. Coit. 



2377. Webber, H. J., and others. A study of the effects of freezes on citrus in California. 

 California Agric. Exp. Sta. Bull. 304:245-321. 22 fig. 1919.— An extended discussion ia 

 given of the effects produced on different varieties and species of citrus trees by the freezing 

 temperatures occurring in California in January, 1913. The composition of the fruits of 

 orange trees (Citrus aurantium) and lemon trees {Citrus limonia) gradually changes follow- 

 ing exposure to freezing temperature. The specific gravity of the juice and the content of 

 sucrose and invert sugar gradually decrease, but the ratio of sucrose to invert sugar does not 

 change. The per cent of acid in the juice decreases slightly as a result of freezing, while the 

 absolute amounts of acid present continues to decrease until practically none remains. Exces- 

 sive loss of moisture from frozen citrus fruits takes place due to the loss of semi-permeability 

 of the external cells. Partially frozen citrus fruits left on the tree continue to increase in 

 size due to thickening of the rind, but the content of sugars and acid gradually decrease for 

 several weeks. — W. P. Kelley. 



2378. Winston 7 , J. R., and H. R. Fulton. The field testing of copper-spray coatings on 

 foliage. Better Fruit 13": 9, 27-28. June, 1919.— See Bot. Absts. 3, Entry 2786. 



2379. Woodbridge, T. R. Co-operation applied to orchard operation. California Citro- 

 graph 4: 116, 142. 1919.— Description of the Liberty Groves Operating Corporation, which 

 is non-stock, based on the membership plan and operated without profit. The corporation 

 owns tools, live stock and all equipment such as tractors, etc., which are necessary and pro- 

 vides labor and supervision for all ordinary citrus orchard operations such as plowing, culti- 

 vating, irrigating, spreading manure, hauling, pruning, etc., except packing and selling. 

 The corporation is financed through a revolving fund secured by assessment. Members 

 may resign at any time and receive their unused assessments back in full. — /. E. Coit. 



2380. Wurth, Th. De schade aangericht door de Kloetuitbareting op de koffie-en Rub- 

 berlanden van den Kloet. [Damage to coffee and rubber by the Kloet eruption.] Proefsta. 

 Malang [Java] Circ. 7. 3 p. 1919.— See Bot. Absts. 3, Entry 2789. 



VEGETABLE CULTURE 



2381. Anonymous. Summer sown beets at Wisley, 1917-18. Jour. Roy. Hortic. Soc. 43: 

 495^97. 1919.— A report of the trial of 81 stocks of beet sown July 11, 1917. A list of the 

 varieties and brief descriptions of each are given.— J. K. Shaw. 



2382. Anonymous. Spring sown beets at Wisley, 1917. Jour. Roy. Hortic. Soc. 43: 488- 

 494. 1919. — A report of the trial of 73 stocks of beet. A list of the varieties, brief descrip- 

 tions and the awards of the committee are given. — J. K. Shaw. 



2383. Anonymous. Mid-season peas tried at Wisley, 1916. Jour. Roy. Hortic. Soc. 43: 

 498-515. 1919.— A report of the trial of 121 stocks of peas sown March 31, 1916. A list of va- 

 rieties, descriptions and notes, also the awards of the committee are given. — J. K. Shaw. 



2384. Anonymous. Late peas at Wisley, 1917. Jour. Roy. Hortic. Soc. 43:516-520. 

 1919. — A report of the trial of 58 stocks of peas sown at Wisley, England May 5, 1917. A 

 list of the varieties, brief description and the awards of the committee are given. — J. K. 



Share, 



2385. Bouqukt, A. G. B. Pollination of tomatoes. Oregon Agric. Exp. Sta. Bull. 158. 

 t9 p. 5 fig. 1919. — -Experiments extending through a period of six years on the pollination 

 of tomatoes grown in greenhouses have shown that it is possible greatly to increase the yield 



