696 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



early Potato blight Alter naria solani, the Colorado beetle, and other 

 insect pests were treated on special plots with Bordeaux-Paris-green 

 mixture. Comparisons were drawn between the above and Paris-green 

 alone. Both were applied in one and two sprayings. It was found that 

 Bordeaux-Paris-green mixture was the most satisfactory, and also that two 

 applications were superior in effect to one only. In addition to the above 

 experiments, seed Potatos were treated with formalin solution, corrosive 

 sublimate, formaldehyde vapour, and formalin and sulphur vapour. In 

 disinfecting, the tubers were moistened before treating. The results 

 indicate that formaldehyde vapour applied to seed tubers in a moist 

 condition greatly reduces the scab. — E. F. H. 



PotatOS. By E. Bartrum, D.D. (Gard. Mag. No. 2602, p. 610; 



12/9/03).— Various points concerning Potato culture are discussed, 

 especially the results of experiments carried out by various County 

 Councils. The question of spraying with Bordeaux mixture, the cost, 

 and details of application are dealt with in a practical and clear way. 



W. G. 



Potatos, Recently introduced. By G. Wythes {Gard. Mag. No. 

 2594, p. 479; 18/7/03). — The comparative merits of newly-introduced 

 varieties of early Potatos are discussed. An impartial description of the 

 most prominent varieties obtained from various sources. — W. G. 



Potato, The Evolution of a. By C. T. Musson (Agr. Gaz. N.S.W., 

 p. 1043 ; October 1903). — A short account of the raising of a new variety 

 of Potato from seed in Australia. The seed came originally from England, 

 and the process of the experiment is given in detail. The object was to 

 get an acclimatised form which would withstand the variable climate better 

 than a variety not accustomed to a particular district. The points aimed at 

 were (a) productiveness, (b) constitution, (c) size, (d) shape, (c) appearance 

 and quality.— H. G. C. 



Potash, Symptoms of Deficiency in. By Willfarth and Wimmer 

 (Zcit. f. Pflanz. xiii. pp. 82-87, 2 plates ; 1903).— The authors have 

 observed that Mangolds grown in a soil with too little potash show this in 

 the leaves. These are curled and assume a yellowish or whitish colour 

 along the margin and veins, while the remainder of the leaf remains dark 

 green. These symptoms are shown on an excellent coloured plate. 

 Deficiency of potash can also be detected from the appearance of the 

 Leaves of Potato, Tobacco, and Buckwheat ; figures of these are also given. 

 It would be a useful guide to growers if these results were confirmed and 

 more widely known. In plants grown with deficiency of potash the pro- 

 portion of top (leaves, &c.) to root is largely increased ; thus in Mangolds 

 it may be as high as 90 per cent, as compared with 30 to 35 per cent, in 

 f ully-manured. Lack of potash also reduces the amount of starch or sugar 

 in seeds, tubers, and other places of storage. Plants are also more liable 

 to attacks of parasites, e.g. green fly, rust, kc. ; while tubers {e.g. of Potato) 

 are more liable to rot when stored. — W. G. S. 



Prickly Pear, Destruction of (<Ju. Agr. Joum. xii. p. 314, May, 

 1903.)— Mr. John Rudd, Superintendent of Police in Ceylon, reports the 



