356 NOTES AND EXHIBITS. 



Mr. A. A. Hamilton exhibited, from I lie National Herbarium, 

 (a) specimens of the "Potato," Solarium tuberosum, showing 

 adventitious tubers in the axils of the stem-leaves (Coll. Miss M. 

 Flockton) ; {b) an example of increased bulb production in the 

 "Snow- Make," Leucojum vernum (Coll. H. Selkirk). Worsdell 

 (Principles of Plant Teratology, i., p. 156) and (loebel (Organo- 

 graphy of Plants. Part i.. p. 1215) attribute the growth of these 

 aerial tubers to interference with underground tuber formation, 

 though the former admits that the phenomenon is occasional when 

 the underground tubers have not been disturbed. In an investi- 

 gation of this habit in the common "Yam," Dioscorea sativa, in 

 which aerial tuber formation occurs normally, Elizabeth Dale(Ann. 

 of Bot., xv., p. 491), suggests that the occurrence is due to the 

 supereession of sexual production by the vegetative method, owing 

 to inability to readily produce seeds. This view is also maintained 

 by C. A. Barker (Ann. of Bot., iv., p. 105) in a paper dealing 

 witli a monstrous form of Nymphaea lotus, which produces tubers 

 in t be place of flowers. The excessive growth in the snow-Hake 

 has probably been stimulated by over-nutrition. 



Mr. E. Cheel exhibited living seedling plants of the following 

 species of Rutaceae, which are all more or less of economic import- 

 ance, and require to be further studied, as there seems to be several 

 Australian forms or varieties imperfectly described, and compara- 

 tively rare: (a.) Triphasia trifoliata De. (7'. aurantiola Lour.). 

 The plants exhibited were raised from seeds obtained from a plant 

 in t lie Botanic Gardens of Suva, in August, 1918. It is com- 

 monly known as "Lime Berry," and the plant was loaded with 

 berries about the size of fruits of the Port Jackson Pig; they were 

 of a reddish-brown or dark orange-red colour, and of an acidulous 

 flavour. (b) Eremocitrus glauca Swingle, Journ. Agric. lie- 

 search, Uept. Agric, Washington, 1914, 85; (Triphasia <jlau<-a 

 Lindl.; Atalantia glauca Hook til., in Benth). Swingle has con- 

 ducted a series of experiments with this and other species of the 

 Citratae group, and regards it as distinct from Triphasia and 

 Atalantia, and has accordingly created a new genus as above. It is 



