HORTICULTURE. 



557 



A furtlior study was ihikIc of tlu' ajiency of the wind in distrilmting plum pollen. 

 Glassslips, such as are used with niieroseopes, were labeled at one end and tlie remain- 

 der painted with a mixture of va.seline and lampblack. These slijis were then 

 exposed for 2 to 24 hours in various ])arts of the plum orchard at the height of the 

 pollinating season and under the most favorable conditions of wind and weather. 

 The vaseline caught whatever pollen was carried against the slips while it was the 

 purpose of the lampblack in the mixture to make the grains more visible. These 

 slips were afterwards examined for jiollen grains. A few grains were found on some 

 of the slips but the amount of i)oIlen transported even the short distance the trees 

 were apart (10 ft.), and in direct line with the wind, was considered far too small 

 for effective jiollination. The conclusion is again reached that these fruits are pol- 

 linated chiefly, if not_ exclusively, by insects, and that the wind plays an inconse- 

 quential jiart in this work. 



The myrobalan plums, F. A. Wal-gh ( Vermont Sta. Rpt. IfiOO, })p. 366-370). — 

 This is a short monograph with liistorical notes on these plums. Their present 

 status is given and 9 varieties des(;ril)ed. 



Summer pruning- of wall plums, A. I'etts {Garden, 59 (1901), Xu. 1538, pp. 332, 

 333). — Details of methods of pruning wall plums throughout the summer. 



Pomelos, H. H. Ilr.ME {Florida Sta. Bui. 58, pp. 385-421, ph. 7,fi{/.i. 4). — Notes are 

 given on the botany and history of the pomelo. 



Shaddock and grajje fruit are given as synonyms of pomelo. The term pomelo is 

 preferred to grape fruit. The term shaddock, while referring to a fruit ])otanically 

 the same as pomelo, is stated by the author to be horticulturally distinct from it, 

 this name being api)lied more especially to the large pyriform or necked varieties of 

 pomelos. It is only within the past 15 years or so that the pomelo has come into 

 commercial importance in Florida. "With regard to its cultuVe, the author states that 

 trees in Florida bear heavily, are no harder to propagate and care for than orange 

 trees, and come into bearing early. The following varieties, which include all those 

 listed l)y nurserymen, are described, and notes given on their origin: Aurantium, 

 Dmican, Excelsior, Hall, Marsh, Pernambuco, Tresca, Triumph, Royal, and Walters. 



The weight, size, and proportion of pulp, rind, and seeds are given for 10 rijie 

 fruits of each of 6 varieties, together with analyses of the separate parts of the fruit. 

 The following table summarizes the physical analysis: 



Plii/sic((l a i)(d [/.'<!.'< of pomelos. 



Average weight. 



Average 

 diameter. 



Average 

 number 

 seeds. 



Pntp. 



Rind. Seeds. 



' Grains. 



Royal 541.48 



Pernambnco 742. 77 



Manville 487. 62 



Aurantium 430. 92 



Walters 721. 3''. 



Triumph \ 534.60 



Ounces. 

 19.1 

 26.2 

 17.2 

 15.2 

 25.4 

 18.8 



Inches. 

 3.20 

 3.75 

 3.10 

 3.00 

 3.75 

 3.15 



46.4 

 61.0 

 67.2 

 37.3 

 56.0 

 43.3 



Per cent. 

 69. 32 

 68. 52 

 74.72 

 68.60 

 68.64 

 65. 16 



Per cent. 

 27.23 

 28.05 

 20.93 

 28.29 

 28. 22 

 31.82 



Per cent. 

 " 3.45 

 3.43 

 4.35 

 3.11 

 3.14 

 3.02 



The average weight of the different varieties, it will be noted, varied from 15.2 to 

 2<).2 oz., and the diameter from 3 to 3.75 in. The percentage of pulp ranged from 

 65.16 to 74.72, of rind from 20.93 to 31.82, and of seeds from 3.02 to 4.35. The trees 

 producing the fruits were not of the same age and had not V)een given the same treat- 

 ment, therefore the relative amounts of pulp and rind in the different varieties are 

 not entirely comparaVjle. 



The i)ercentages of phosphoric acid, potash, and nitrogen were greater in the seeda 

 in every instance than in the pulj) or rind. The percentage of phosphoric acid in 



16275— No. - 02 5 



