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JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



mediocre manner to Linaria spuria; Ehinanthus Crista-galli, Viola 

 tricolor, Calystegia septum still less or not at all to the stimulus of the 

 stigmas of Siiidj'is arcensis, Lychnis dioica, Solanum nigrum, Cam- 

 pantda Bapunculus t Odontites rubra, Sec. The fact that germination is 

 difficult or impossible in the presence of plants of different families explains 

 the difficulties of hybridisation. M. Richer has, however, remarked some 

 very interesting instances where germination results in such cases, as 

 Rhododendron ponticum under the influence of Tradescantia virginica, 

 Linaria vulgaris under that of (Enothera biennis, &c, and proposes to con- 

 tinue his experiments with a view to ascertaining other causes which, under 

 natural conditions, ma/ hinder the protrusion of the pollen-tubes on alien 

 stigmas.— C. T. D. 



Pollination in Orchards. By Professor F. A. Waugh (U.S.A. 

 Hort. Soc. Minnesota, Rep. 1902). — The author's work has been chiefly 

 with Plums, and he found that a very large majority of varieties were self- 

 sterile. Experiments on cross pollinating show that the pollen of one 

 variety will fertilise almost any other variety providing that they blossom 

 at the same time. — F. J. C. 



Potato Moth. By Walter W. Froggart, F.L.S. (Agr. Gaz. N.S.W. 

 pp. 321-326; April 1903).— Among the many pests that attack the 

 Potato this is certainly one of the most widespread ; for though there 

 are others, such as the Colorado beetle, that in its native land does more 

 extensive damage locally, yet this little brown moth, from its habits, can 

 be so easily transported from place to place in seed Potatos, old bags, and 

 packing that it is only a question of time when it will have probably 

 followed the Potato all over the world. At present it is unknown in 

 England and the greater part of Europe, and is only a slight pest in a 

 section of the United States. Meyrick suggests that it would not become 

 a pest in any temperate climate where cold wet winters were the rule ; 

 Iji it as it is so well known in New Zealand and Tasmania this does not 

 seem to hold gcod as regards climate. Though this Potato pest was 

 recorded from Tasmania as far back as 1854 by Captain Berthon, it was 

 not described or given a name until Boisduval bred a specimen from 

 Potatos grown in Algeria in 1874. Quotations are made from articles 

 Written by Meyrick (1880), Tepper (1882), Tyron (1889), Olliff (1892), 

 French | L898), and Kirk (1894). There are two well-defined infestations 

 by the Potato moth : the first from the winter brood, coming forth when 

 ; 1 1 1< 1 ruining the crops by killing the foliage, and the 

 Beeond when the moths from this brood lay their eggs upon the Potatos 

 themselves, either in the field or after they are stored. A general 

 OCOnnt of the life-history of this pest follows, together with suggestions 

 Cox remedies. — II. G. C. 



Potato Scab, Prevention of. By R. A. Moore (U.S.A. Exp. Stn. 

 Wiiconsin, Bull n. 98, 1903).— The disease known in the United States 

 Pol kto cab 1 may be prevented by submerging the uncut seed Potatos 

 In the formaldehyde solution, which should be made by pouring one pint 

 oi formaldehyde into twenty-five gallons of water, and the Potatos sub- 

 fed for two hours. The percentage of scabbed Potatos was in this 



