880 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Pyrethrum Powder as insecticide. By Ed. Andre {Rev. Hort. 

 pp. 457-8, Oct. 1, 1901). — Found to be peculiarly efficacious against aphis, 

 scale, woolly aphis, red spider, and crickets, when applied dry by air 

 blasts. The proper source is Chrysanthemum cineraria folium, since 

 P. roscum is largely inert ; must be kept from the air (p. 508). — C. T. D. 



Pyrus Malus Scheideckeri (Gartenflora, Aug. 15, 1904, p. 417 ; 



coloured plate). — The parentage of this beautiful flowering Crab is here 

 given as being Pyrus Malus floribunda x Pyrus Malus prunifolia. 



R. C. R. N. 



Pyrus Niedzwetzkyana. By W. B. H. (Bot Mag. t. 7975).— Native 

 of Central Asia. Nat. ord. Rosacea ; tribe Pomece. This is regarded as 

 an Apple, collected in South-West Siberia ; it is both wild and cultivated. 

 Excepting leaves, all parts of the tree are red. Flowers deep rose-purple, 

 1 1 inch across. Fruit conical, 1 to 2 inches long, crimson-purple with- 

 out, with rose-purple flesh. — G. H. 



Queensland, Tropical Plants suitable for North. By Howard 



Newport, Manager, State Nursery, Cairns (Qu. Agr. Joum. xiv. pt. 5, 

 May 1004, p. 358). — This communication is in the form of a table setting 

 forth the common name, botanic name, form of growth, how propagated, 

 seasons to propagate, time of bearing, remarks concerning 120 tropical 

 plants of economic value which are already introduced, or might be 

 introduced successfully into the colony. — M. C. C. 



Quince, The Serbian, ' Wranjska Dunja.'— By H. Breitschwerdt 

 (Die Gart, No. 19, p. 218, February 6, 1904).— The fruit is Pear-shaped, 

 and when well grown is frequently 2 lb. to 3 lb. in weight, rarely less 

 than 2 lb. The finest fruit is usually obtained from young pyramids 

 (all grafted on the ordinary variety) and grown in good loamy soil, which 

 should not be too dry. — G. R. 



Regeneration and its Connection with the Injury-stimulus 

 (Traumatropism). By G. P. Burns (Beih. Bot. Cent, xviii. Abt. i. 

 pp. 159-164 ; with 4 images in the text). — The experiments tend to show 

 that roots will continue to form the (traumatropic) curve due to injury so 

 long as wounded tissue is found, that the wounded tissue forms a con- 

 stant irritant, and that this irritant is removed when regeneration is 

 complete. The experiments with plaster casts led to the conclusion that 

 the latent period is not prolonged by mechanical means, and that the 

 influence of the stimulus is not conducted to the elongating zone and 

 there held from one to eight days. Pea and Bean seedlings were employed. 



G. F. S.-E. 



Regeneration in the Case of Plants. By E. Kuster (Beih. Bot. 

 Cent. xiv. pp. 316-326, with 6 text figures ; also xv. pp. 421-426).— The 

 author found that adventitious shoots were developed from the hypocotyl 

 of Anagallis cutrxdea when the seedling was decapitated below the 

 insertion of the cotyledons. These showed irregularities such as un- 

 equal leaves, bulbil-like appearances, Sec. The same was found to be the 

 case with Linaria Cymbalaria. If the upper part of the seedling 



