No. 2, June, 1921] HORTICULTURE 167 



1011-1014. 1920. — It is contended that bud-variations are the cause of varieties "running 

 out." Examples are given from the citrus fruits as well as from the apple, pear, olive, and 

 cherry. Mention is also made of Myrtus communis and Acer negundo var. folis argentio varie- 

 gatus. It is therefore concluded that sexual reproduction at intervals is advisable in hor- 

 ticultural varieties. — C. H. Farr. 



1138. CoNDiT, I. J. The fig in the Sacramento valley. Monthly Bull. Dept. Agric. Cali- 

 fornia 8: 591-595. 1919.— The following are the 4 varieties of figs chiefly grown commer- 

 cially in California: Mission, Adriatic, Smyrna, and Kadota. The Smyrna, although of 

 better quality than the Adriatic, is more exacting as regards climate and soil requirements, 

 and although yielding a better dried product is not as good a shipper as the Kadota. For 

 Sacramento valley the author recommends the Black Mission, which is an excellent variety 

 for commercial planting on account of the quality, and the certainty and size of its crop. — 

 E. L. Overholser. 



1139. Crafts, H. A. Cover crops for our orchards. Sci. Amer. 123: 567, 582-583. ij^g. 1920. 



1140. Crow, J. W. Biennial fruitbearing in the apple. Sci. Agric. [Canada] 1:39-40. 

 1921.— Biennial bearing is not a fixed characteristic of Duchess and Wealthy varieties. 

 Growths of spurs are classified according to length, those from 4 to 9 mm. bearing nearly all 

 the fruit. To secure annual fruiting it is necessary to stimulate growth of the tree in the 

 non-bearing year. Experiments at Ontario Agricultural College indicate that this is accom- 

 plished by moderate heading back of small branches in the non-bearing year, and by apply- 

 ing nitrate of soda in the early spring. Observations show that 75 per cent of fruit spurs 

 on these varieties have completed their growth for the season by the time the first blossoms 

 have well set. — B. T. Dickson. 



1141. Daniel, Lucien. Recherches sur la greffe des Solanum. [Investigations of the 

 grafts of Solanum.] Compt. Rend. Acad. Sci. Paris 171 : 1074-1076. 1920.— A study of grafts 

 of potato on tomato and on mad-apple. Some of the characters of the stock, such as delay 

 in maturing of the fruits, are imparted to the scion, thus making a situation similar to that in 

 grafts of Vitis vinifera on V. rupestris. These new characters are transferred by asexual 

 propagation. The tomato used as a stock is also found to affect the nature of the fruit of 

 the mad-apple. — C. H. Farr. 



1142. DoRRis, G. Establishing the filbert grove. Amer. Nut Jour. 10:34-35. 1919.— 

 Soil must be retentive of moisture,— river bottom soil is best. As filbert blooms and polli- 

 nates in mid-winter, location requires no consideration as to frost conditions. The Davidiana 

 is the best pollenizer for most varieties. Each year's growth is to be cut back about 2 feet; 

 should not head higher than 2 feet,— preferably 1 foot.— £. L. Overholser. 



1143. Enper, V. Utilization des serres sans chauffage: production des legumes. [Utiliz- 

 ing greenhouses without heat: growing vegetables.] Revue Hort. 92: 179-180. 1920. — The 

 specific crops and varieties most suitable for culture in greenhouses without artificial heat, 

 together with the directions for planting and culture of the same, are given.— ^. J. Kraus. 



1144. EsTEBAN de Faura, Antonio. Cultivo del olivo. [Cultivation of the olive.] El 

 Agricultor [Santiago, Chile] 5: 123-126. 3 fig. 1920.— Reprinted from La Hacienda.— J. A. 

 Stevenson. 



1145. Gardner, V. R. Bud selection with special reference to the apple and strawberry. 

 Missouri Agric. Exp. Sta. Res. Bull. 39. 27 p. 1920.— See Bot. Absts. 3, Entry 1155. 



1146. GavilXn, Juan. Produccion y cultivo de platanos. [Production and cultivation 

 of bananas.] Informacion Agric. [Madrid] 11: 1-2. 1 fig. 1921.— The banana industry of 

 the Canary Islands is discussed. — John A. Stevenson. 



