170 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



concors, has been found attacking leaves of potatoes in Vermont and 

 producing rather obscurely defined pale spots, from J to f inch across, 

 bearing on the lower surface a pale violet-grey fungus growth, This 

 disease seems most abundant in old gardens and in the northern parts 

 of the district in which the potato is cultivated It has been recorded 

 from parts of Germany, Russia, Sweden, and Switzerland. The 

 characters of growth of the fungus on various media are described, and 

 the results of inoculation experiments are given. Spraying with 

 Bordeaux mixture, as for Phytophthora, is recommended,—- ]?, J, C, 



Potato-spraying: Experiments in 1905. By F. C. Stewart, 

 H. J. Eustace, and F. A. Sirrine (U.S.A. Exp. Stn. Geneva, Bull. 279, 

 5 plates, 1 map ; May 1906). — In 1902 a ten-year course of potato-spraying 

 experiments was planned, of which four years are now completed. 

 Summaries of the results obtained in previous years are given, and 

 full details concerning the soil, planting, cultivation, <fcc., of the crops 

 experimented upon. Objections have been raised concerning the Station 

 experiments — viz. that -fa acre is too small a plot, that sprayiug is done 

 more thoroughly than farmers would do it, that it is difficult to ascertain 

 the cost, and that extra good care is given to the crop at the Station in 

 order to obtain large yields. These objections have been met by instituting 

 experiments on ordinary farms, carrying out the spraying as it would be 

 done by farmers, and the results are detailed here. In all, the results of 

 seventy experiments are dealt with. In these " business " experiments 

 in 1905, 160 1 acres were sprayed, with an average increase in yield 

 of 46| bushels, at an average cost of spraying per acre of $4.25, or for 

 each spraying of 98 cents, and an average profit per acre of $20.04. In 

 addition to this fifty volunteer experiments were carried out on 407 acres. 

 The average increase in yield was 59 bushels 32 lb., the average cost 

 of spraying per acre (twenty-nine experiments) $4.57, the average cost of 

 each spraying 92 cents, and the average profit per acre $29.85. The 

 general conclusions are as follows : — (1) Soda Bordeaux is not superior 

 to Lime Bordeaux for potatoes ; (2) Paris green, at the rate of 1 lb. to 

 2 lb. per acre, may be added to Bordeaux mixture without interfering 

 with its efficiency or injuring the potato plants, and either this or 

 arsenite of soda may be used as a remedy against the potato rlea beetle ; 

 (3) potato foliage is not injured by spraying on hot summer days with 

 a solution at 40°- 54° F. ; (4) spraying tends to prevent rot caused by 

 Pliytophthora infestans ; (5) the yield of marketable potatoes is always 

 largely increased ; and (6) spraying should be begun when the plants 

 are from 6 inches to 8 inches high, and repeated at intervals of ten to 

 fourteen days. F. J. C. 



* 



Primula Cockburniana. By S. A. Skau (Bot. Mag. tab. 8073).— 



China. Nat. ord. Primulaceae ; tribe Primulcae. Perennial herb. Leaves 

 2-5 inches long ; corolla rich orange-red, \ inch diam. — G. II. 



Primula hazarica. By P. Hariot (he Jarclin, vol. xx. No. 466, 

 p. 212 ; July 20, 1906).— Discovered in the Western Himalayas and 

 Cashmere by |)uthie. Belongs to the section Callianthae, which 



