152 HORTICULTURE [BoT. Absts., Vol. VII, 



before the frosts. The same pollen in maltose solution subjected to a temperature of — 8°C. 

 germinated very little. A temperature of — 2.5°C. reduced the germination about half.— 

 Notes are given on the relative amount of injury to different varieties of peaches and cherries, 

 and tables show the same for pears and apples. The greatest injury was suffered by the 

 almonds, and then in order of decreasing injury came peaches, pears, plums, apples, and 

 cherries. Bibliography is appended. — F. M. Blodgett. 



987. Matons, August. La poda de I'olivera. [Pruning of the olive.] Rev. Inst. Agric. 

 Catalan de San Isidro 69: 22-24, 37-38. 1920. 



988. Matthews, C. D. Report of the division of horticulture, North Carolina Agric. 

 Exp. Sta. Ann. Rept. 42: 59-64. 1920.— A statement concerning the subject matter of inves- 

 tigations in progress, including tests on dehorning of peach trees and hardiness of peach 

 varieties, variety testing, breeding, and top working of pecans, cultural practices with 

 strawberries, and variety testing, storage, and selection of sweet potatoes. — F. A. Wolf. 



989. Meek, B. B. Oranges for Thanksgiving. Monthly Bull. California State Com- 

 mission Hort. 8:367-370. 1919. 



990. Moore, J. G. Scion root production by apple trees in the nursery. Proc. Amer. 

 Soc. Hortic. Sci. 16:84-88. (1919) 1920.— Studies were made at the Wisconsin experiment 

 station concerning the possibility of producing apple trees on their own roots through using 

 long scions in root grafting and planting such grafts deep in the nursery row. There were 

 found to be wide differences in the ability of different varieties to produce scion roots. 

 Although there was fluctuation from year to year in the relative percentages of trees of 

 given varieties which produce roots, still for the most part the relative ability held fairly con- 

 stant. A table of eighteen varieties showing the percentage of trees which rooted each year 

 during the years 1914 to 1918, is included. It was found that with most varieties, even after 

 three years in the nursery, the number of trees having sufficient scion roots to support them- 

 selves was very small. A table is included which shows that a higher percentage of grafts 

 produce strong scion roots when grown in moist soil than when grown in dry soil. Groups 

 of trees were planted at varying depths of from two to six inches. While there were some 

 instances in which deeper planted grafts did not produce scion roots as well as the shallower 

 ones, still, for the most part, the increase in root production was in proportion to the depth of 

 planting. It was suggested that this was true because there was more soil moisture sur- 

 rounding the basal portion of the deeper planted scions. The author states that two-year-old 

 trees did not, under ordinary nursery conditions, possess sufficient roots to sustain them- 

 selves if the stock roots were removed. He also states, "It is clearly evident that if a large 

 proportion of apple trees purchased by fruit growers are to possess at the time of planting 

 scion roots sufficient to support them, it will be necessary to devise some new methods of 

 propagation. Doubtless many of the long scion trees, which show few or no roots at planting 

 in the orchard, develop them within two or three years after planting. However, if this is 

 not so, then the additional care and expense in propagating trees from long scion grafts as 

 now practised is largely wasted." — E. C. Auchter. 



991. Munson, K. W. Grafting the fruit-tree. Agric. Jour. [British Columbia] 4:49. 

 1919. 



992. Munson, K. W. Intensive fruit-culture in Fraser Valley. Agric. Jour. [British 

 Columbia] 4: 104. 1919. 



993. Munson, K. W. Pruning the balanced fruit-tree. Agric. Jour. [British Columbia] 

 4: 14-15. 1919. 



994. Pachano, Abelardo. El mildew de la vina. [Downy mildew of the grape.] Quinta 

 Norma. Estac. Exp. Circ. 9. 22 X 15 cm., 8 p. Ambato, 1918.— See Bot. Absts. 7, Entry 

 1198. 



