1168 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Michaelmas Daisies, The best. By Edwin Beckett (Garden, No. 

 1611, p. 229, 4/10/02). — Few flowers have been so improved during the 

 past thirty years as the Michaelmas Daisy. There are now many 

 varieties, and great care is necessary in making a selection. We replant, 

 trench and manure the border every two years, dividing the clumps into 

 small pieces. The best varieties in each section are given. — E. T. C. 



Mites attacking- Begonias. By C. R. Fielder (Gard. Ghron. 

 No. 824, p. 264 ; Oct. 11, 1902). — The rusty and crippled appearance of 

 Begonias which is only too common, particularly with ' Gloire de Lor- 

 raine,' which has generally been attributed to a fungus, has now been 

 proved to be caused by a mite belonging to the genus Tarsonymus. This 

 mite is so small as to be hardly visible to the naked eye ; it may be de- 

 stroyed by dusting the infested shoots with tobacco powder, or dipping 

 the plants in tobacco water (any of the remedies which kill " Red Spider " 

 would be useful). — G. S. S. 



Morina longifolia. By H Olbiich (Die Gart. p. 5, 4/10/1902).— 

 Illustration of a fine group in flower, which when well grown is perhaps 

 the best of the " Thistles," and a truly showy and interesting perennial. 

 Quite hardy in the whole of Europe. — G. B. 



MosquitOS. By Dr. J. B. Smith (U.S.A. Exp. Stn., New Jersey, 

 Special Bull., 8/1902 ; 2 figs.). — The salt-marsh mosquito, Culex 

 sollicitans, is very troublesome near the coast. It is recommended that 

 the breeding-places, i.e. pools, and marshy land near the sea, should be 

 destroyed ; in cases where these cannot be immediately drained, sprinkle 

 paraffin oil over the pool, and sweep the surface well with a broom, so as to 

 get the oil between the grass, Sec. This will kill the larvae and pupa? 

 within an hour. — F. J. C. 



Mosses (exotic), Doubtful (Beih. Bot. Cent. bd. xiii. ht. 1, pp. 

 105-111). — Herr Adalbert Geheeb gives a list of synonymies as well as 

 critical remarks regarding nineteen Mosses from South America, South 

 Africa, Australia, Madeira, Canary, China, Georgia, West Indies, and the 

 South Sea Islands.— G. F. S.-E. 



MOSS on Tree-trunks. By P. Hariot (he Jard. July 20, 1902, 

 p. 209). — Researches on this subject show the different effects of the same 

 aspect in different climates. — C. W. D. 



Mulberry Disease in Japan. By U. Suzuki (Zeit. f. Pflanz. xii. 

 pp. 203 226, 258-278, 2 plates ; 1902).— This disease, which has caused 

 much loss to the silkworm industry in Japan, has been investigated by a 

 committee. Professor U. Suzuki (University of Tokyo) gives an account 

 of his chemical and physiological studies. The disease has only a second- 

 ary interest in Britain, but the methods of research are useful because 

 they are of a kind not generally used in investigating diseases of plants. 

 The Mulberry-trees become reduced in size and dwindle away. Micro- 

 organisms are only secondary agents in destruction. The chief cause is 

 summer pruning and excessive removal of leaves, whereby a deficiency in 



