NOTES AND ABSTKACTS. 



141 



stem, leaf blade or petiole), Abutilon striatum (hair from ovary surface), 

 Ly coper sicum esculentum, Whitlavia grandiflora (hairs), Lobelia ErinihS 

 and Saxifraga cotyledon (hair from leaf -edge). The second paper deals 

 with exceptional cases of plasmolysis in which the protoplasm is not 

 impermeable to the substances in solution. — G. F. S.-E. 



Prunus serotina (Ehrhart), Primus virginiana (Miller). By 

 F. B. Power and C. W. Moore (Jour. Chem. Soc. vol. xcv., March 1909, 

 pp. 243-261). — An investigation into the constituents of 'wild cherry 

 bark,' of which hitherto little has been known, notwithstanding its use 

 for medicinal purposes. The specimen examined yielded hydrocyanic 

 acid, benzoic acid, an aromatic essential oil present in too small 

 quantity for immediate investigation, oleic, linolic, palmitic, and stearic 

 acids, ipuranol (a solid dihydric alcohol also found in Ipomoea purpurea, 

 nutmeg, and olive bark), methylaesculetin (a glucosidal compound allied to 

 one found in the horse chestnut and in seeds of Euphorbia Lathyris) 

 protocatechuic acid, ^-coumaric acid, and trimethygallic acid (a substance 

 not hitherto found in nature). — W. A. V. 



Pseuderanthemum seticalyx (Bot. Mag. tab. 8244).— Nat. ord. 



Acanthaceae ; tribe Justicieae ; Tropical Africa. Under- shrub, erect ; 

 leaves ovate ; inflorescence spiked ; corolla salver-shaped, limb cinnabar- 

 red, 1 inch diameter. — G. H. 



Psylla (Apple Sucker). By the Duke of Bedford, E.G., and Spencer 

 U.Pickering, F.R.S. (Woburn, Tenth Beport, 1909, pp. 26-34).— The best 

 results in controlling this pest were obtained by spraying with a nicotine 

 solution between the time of the swelling of the fruit buds and the fall of the 

 blossoms, a mortality of 90 to 99 per cent, resulting when the strength of 

 the solution was not below '075 per cent. (e.g. one pound of Voss's solution 

 in 10 gallons of water). Growers should ascertain the strength of the 

 solution they buy. — A. P. 



Rehmannia angulata. By Max Ghierbrandt (Le Jardin, vol. xxii. 

 No. 513, p. 204 ; July 5, 1908 ; 2 figs.).— The author finds this to be 

 a much hardier plant than is generally supposed. It resists frost in an 

 unheated greenhouse better than Pelargoniums, and may be planted out 

 by the end of April. A month later it will be in full flower, and 

 continues to bloom throughout the summer and autumn. Moreover, 

 it will bear taking up and potting for exhibition at any moment, with 

 subsequent replanting. The flower lends itself as readily as Salpiglossis 

 or Mimulus to the production of new variations in colour. Already such 

 varieties of the common B. angulata as tigrina and rosea are in the 

 market. — F. A. W. 



Respiration, Rise of Temperature in. By George T. Pierce (Bot. 

 Gaz.j September 1908, pp. 193-202). — The author has found a new and 

 efficient method of exhibiting the increased temperature in respiration 

 and fermentation. 



This consists essentially in the employment of Dewar's flasks or 

 double-walled glass vessels with a vacuum between the two walls. (The 



