No. 1, August, 1920] HORTICULTURE 69 



grouped and considered under the headings of fit those for trees grown i md pla- 



teaus and (2) those for trees grown in valleys, a comparison being made for each variety g" 

 in the two situations. The results show considerable variation in Mir sugar content, (here 

 being greater variation among those grown in the valleys. According t<> the author the fol- 

 lowing points are indicated by the results at hand: (1) The topographic position exercises 

 an influence upon the production of sugar in certain varieties of cider apples. (2) The effect 

 of l he loeat ion on the sugar content is not uniform, in some varicl ies it is greater when grown 

 on the higher elevations and with others it is greater when they are grown in valleys. f3) 

 The differences in the weights of sugar in the juice from the apples grown on the uplands and 

 in the valleys vary from 1 to 10. ss grams per liter. (4) The effect of topography on the sugar 

 content of cider apples is generally feeble. The effect of topography is less than that of va- 

 riety, which depends mainly on the composition of the soil. — A. B. Beaumont. 



514. Tufts, Wauhen P. Pollination of the Bartlett pear. California Agric. Exp. Sta. 

 Bull. 307: 369-390. 8 fig. 1919. — The majority of the varieties of pears grown in California 

 bloom for comparatively brief periods only, but all of them produce an abundance of pollen. 

 Artificial pollination experiments showed that Bartlett pears are partially self-sterile when 

 grown in certain localities and wholly so in others. All the other commercial varieties are 

 capable of cross fertilizing the Bartlett variety. It was noted that the fruit resulting from 

 cross-fertilization with pollen from a different variety tended to drop less freely in June than 

 was the case with self-fertilized fruits. It is recommended that other varieties of pears be 

 planted intermittently throughout an orchard of Bartlett pears as a means of promoting cross- 

 fertilization. [See Bot. Absts. 4, Entry 798.]— IF. P. Kelley. 



515. Tufts, Warren P. Almond pollination. California Agric. Exp. Sta. Bull. 306: 

 :I37-36G. 15 fig. 1919. — It is shown that all the common varieties of almonds grown in Cal- 

 ifornia are self-sterile to a large extent and certain of them are inter-sterile. The different 

 varieties may be roughly divided into two classes on the basis of the time of blooming, and 

 considerable differences were noted in the amounts of pollen produced by the different vari- 

 eties. Experiments demonstrated that cross-pollination can be effected between certain 

 varieties very readily whereas other varieties are inter-sterile. It is shown that mixed plant- 

 ing of inter-fertile varieties in the same orchard results in increased yields of fruit. The inter- 

 pollinating relationships of the different varieties are shown tabularly. The effects of meteor- 

 ological conditions and insects on pollination are briefly discussed. The common honey bee 

 is though to be the best pollinating agent. [See Bot. Absts. 4, Entry 797.]— IP. P. Kelley. 



FLORICULTURE AND ORNAMENTAL HORTICULTURE 



516. Acosta, Celsa. Sobre el cayeput. [The cajuput.] Revist. Agric. Com. jy Trab. 

 2: 535-537. 3 fig. 1919. — Description of cajuput tree (Melaleuca leucadendron Linn.) and its 

 uses. — F. M. Blodgell. 



517. Arango, Rodolfo. La palma real, su belleza ornamental y utilidad practica. [The 

 royal palm as an ornamental and useful plant.] Revist. Agric. Com. y Trab. 2: 557-559. 2 fig. 

 1919. 



518. Baxter, Samuel Newman. How nurserymen may best compete for the Christmas 

 tree market. Florists' Exchange 49: 133. 1920. — Ordinary nursery ground is too valuable 

 for growing large Christmas trees; but small trees are gaining in favor with dwellers in 

 small apartments and can be profitably grown. Nursery-grown, bushy stock is more attrac- 

 tive than the wild, the supply of which may soon become exhausted or unavailable. The 1- to 

 2-foot size could be offered in 6- or 8-inch pots, and the 2- to 4-foot size in larger pots or tubs, 

 both at reasonable prices. Frequent transplanting is unnecessary; thinning of plants in the 

 nursery row and shearing will assist in making bushy specimens. Figures are given of ex- 

 pected yield per acre over a ten-year period. — L. A. Minns. 



