HORTICULTURE. 441 



believed by the author to be superior to the French prune for all fancy and middle 

 grade stocks. The tree has proved a splendid grower on either peach (ir almond 

 stock. 



Olives, G. E. Colby and F. T. Bioletti {California Sta. Buh. 123 and 137, rev. eel, 

 pp. 4-^,Jifj!^. 5).— These bulletins have been previously noted (E. S. R., 11, p. 46; 13, 

 p. 747). Methods of olive cultivation, oil making, and pickling, as observed in Cali- 

 fornia, are discussed, and the varieties most commonly grown described, together 

 with the diseases which commonly affect them. A consideral)le number of analyses 

 with regard to the percentage of oil in the different parts of the fruit, an<l data as to 

 the number of olives per pound and the proportion of i)it to tlesli, ha\e Ijcen added 

 for a large number of different varieties of olives. 



The olive; its culture, oil, and adulteration, L. Cabrie {Der Olivenbaum, seine 

 Kultur, sein Oel und (lessen Fivlschungen. Nice: Imprimerie des Alpes-Maritinies, 1901, 

 pp. 38). — This is a popular discussion of olive culture, including notes on its diseases 

 and directions for the manufacturing and preserving of olive oil. Various chemical 

 tests used to determine the purity of olive oil are also included in the work. 



Cultivation, enemies, and commerce of citrus fruits, G. del Vlscio {Colti- 

 vazione malattie e conunercio degli (igrmiii. Bart, Itahj: Pasquah Losasso, 1900, pj). 

 176, figs. 36). — Part 1 of this work includes, under the general heading of culture, notes 

 on botany, propagation, nursery management, soils, climate, irrigation, yields and 

 profits, chemical composition, fertilizing with commercial fertilizers and manures, 

 etc. In part 2, under enemies, are considered the insects and diseases affecting 

 citrus fruits, and climatic conditions. Part 3 is concerned with the production and 

 connnerce of citrus fruit.s. 



Trees on sour and Citrus trifoliata stocks, G. L. Taber {Florida Times-Union 

 and Citizen, 1902, Aug. 8, p. 6). — In 1899 the author planted an experimental plat of 

 100 orange and pomelo trees. There w-ere 25 varieties and 4 trees of each variety. Half 

 the trees were worked on sour stock and half on Cifnis trifoliata. The trees on the 

 sour and on the C. trifoliata stock were alternated in the orchard with each other 

 and planted 30 ft. apart each way. At the time of writing (July 26, 1902) the aver- 

 age height of the trees on sour stock was 8 ft. 2 in. and the average breadth 9 ft. 2 in. 

 The average height of the trees on C. trifoliata was 6 ft. 2 in. and the average breadth 

 7 ft. Adding together the fruit produced in 1901 and 1902 and averaging the amount, 

 the trees on sour stock produced a total average of 69 oranges per tree for the 2 

 years. The trees on the C. trifolicda stock have averaged 93 oranges each for the 2 

 years, an increase of nearly J over the trees on the sour stock. The fact that the 

 trees on C. trifoliata could have been set } to i closer than the trees on the sour stock 

 and that they might be frozen to the banking 1 year- out of 3 and still produce a 

 good crop of fruit 1 year out of 3 is taken as indicating the advantages of this stock 

 for frosty sections. Not all varieties budded on C. trifolicda stock gave equally good 

 results. Two varieties of orange, viz, Jaffa an(T King, and one variety of pomelo, 

 Duncan, have made larger growth on C. trifoliata than the corresponding varieties on 

 sour stock planted alongside of them. The following varieties on C. trifoliata also 

 compare well as regards growth with those on sour stock: Du Eoi, Early Oblong, 

 Homosassa, il-adam Vinous, INIagnum Bonum, Nonpareil, Pineapple, and Tangerine. 

 Another point brought out in this connection is that while C. trifolicda is naturally a 

 much more dwarfed tree than most varieties budded on it, it will nevertheless inva- 

 riably grow faster than the bud inserted on it. In other words, when the diameter of 

 the bud just above the point of union is jierhaps 3 in. the diameter of the C. trifoliata 

 stock just below the union will be 3^ in. 



The trifoliata down South {Florida Times-Union and Citizen, 1902, Aug. 2S,p)p. 

 .5, 6). — The value of Citrus trifoliata stock for adverse situations is discussed and some 

 data given on the productiveness of buds on this stock. A bud 10 in. high of the 

 01)long Kumquat on this stock ripened 34 good-sized fruits. A bud of the same 



