19^'») HORTICULTURE. 239 



A non-splittiiis; Smyrna fig and its liistory. <^. P. RrxFonn (Fiff oiid Olive 

 Jour., Jf {JU20), A'o. 8, pp. 9, Hi). — Tlio varioty Ihtc described originntcd from 

 ccrtJiin cuttings which were imported from Asia Minor by the author in 1882 

 and planted on the Stanford University ranch. The U. S. Department of 

 Af,'rlculture has propagated and distributed the variety, and its value lias be<m 

 fairly well determined, especially in the San Joaquin Valley. The autlior now 

 proposes to name the variety " Stanford " in honor of the late Governor lieiand 

 Stanford, founder of Leland Stanford Junior University. 



The Kadota (ij?, W. S. Ci-ark {Los Angeles, Cal.: The Fig and Olive Jour., pp. 

 ,44, figs. 20). — A treatise on the origin, planting, and care of this California fig 

 variety. 



The hybrid bearing grapes in 1919, E. P^e-Laby {Rrv. Vitic, 52 (1920), 

 No. 1338, pp. 131-134)- — Notes are given on a number of direct-bearing hybrid 

 grapes which, after several years of testing, have been found to possess real 

 merit. 



The table raisin hybrids, PliE-LABY (Vie Agr. et Rurale, 16 {1920), No. 19, pp. 

 S2o-327). — Descriptive notes are given on a number of Franco-American grape 

 hybrids that have been found to produce d(>sirable table grapes. 



Some observations concerning pollination of olives, L. O. Bonnet (Fig 



and Olive Jovr., 4 {1920), No. 12, p. 4)- — A contribution from the University of 



I CaUforuia discussing some of the causes of crop failure among olives, and 



I giving the results for the first year of pollination experiments conducted at 



i Pomona. These results strongly indicate that most olive trees bear better when 



cross-pollinated. They also indicate that as a rule large varieties of olives are 



more fertile than the smaller varieties. 



j A preliminary revision of the North American and AVest Indian avocados 



I (Persea spp.) , S. F. Blake {Jour. Wash. Acad. aSci., 10 {1920), No. 1, pp. 9-20, 



', figs. 2). — A contribution from the Bureau of Plant Industry, of U. S. Depart- 



; ment of Agriculture, comprising a preliminary treatment of the relaticmship 



of the forms of the avocados which occur in Mexico, Central America, and the 



^^^'st indies. The present revision is based upon material collected for s(>veral 



1 a IS by W. Popenoe. 



The conservation and application of mannres, A. D. SnAjrEL {Cal. Citrogr., 



'' {1920), No.'T, pp. 213, 240-243, figs. 3). — A discussion of the utilization and 



application of manures for improving citrus orchard soil conditions in southern 



California, including some data secured from the Calfornia Fruit Growt>rs' 



! Exchange .showing the extent to which manures are used in citrus orchards at 



i the present time. ^ 



li Results of five years' individual tree performance records with pruned 

 and unpruned lemon trees, A. D. Shamel {Cal. Citrogr., 5 {1920), No. 4, PP- 

 102, 122, 123, 128, figs. S). — Ob.servations were made on the yield of a number of 

 Kureka lemon trees that had been injured by low temperature during the 

 winter of 1912-13 and were subsequently pruned ba(;lv to assist in their re- 

 covery. Some of the trees were severely pruned, others received moderate 

 pruning, and others were left unpruned for the sake of comparison. 



The results, in general, show tliat heavily-pfuned trees produce consider- 

 ; ably less fruit than lightly-pruned trees, and that lightly-pruned trees produce 

 less fruit than unpruned trees without appreciably improving the ccunmercial 

 riuality of the fruit. The fruits on the pruned trees grew more rapidly than 

 'he fruits on the unpruned trees. The author concludes in general that care 

 amst be taken to avoid too great a reduction in the bearing area of lemon 

 trees. On the other hand, a certain amount of pruning seems justifiable because 

 the fruit can be brought up to size more rajiidly, 

 187890°— 20 4 



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