No. 1, May, 1921] MORPHOLOGY, ETC., VASC. PLANTS 65 



436. Francos, G. Self-graf ting by approach. Cyprus Agric. Jour. 14, 15: 145-146. 1919, 

 1920. — The union of 2 plants of Phaseolus muUiflorus was observed by the author to have 

 occurred some 2 feet above the ground, from which point they became joined together in 1 

 stem. One of the stems was cut off 3 inches below the point of union and it was found that 

 the upper portion of the plant was able to draw its nourishment from the one on which it 

 was self-grafted. The most interesting feature, however, was the putting forth of aerial 

 roots at the point where the stem was cut off. — W. Stuart. 



437. Grier, N. M. Light correlated variations of the sterile stem of Equisetum sylvaticum. 

 Rhodora 22: 165-167. 1920. — In a study of this species from a colony growing at Bellevue, 

 Pennsylvania, the author makes comparisons between plants growing constantly well shaded 

 and those receiving sunlight throughout the day. Correlation tabulations from 100 indi- 

 viduals of each habitat indicated that those growing in the sun had on the average a larger 

 number of whorls to the stem, and more leaves to the particular whorl chosen for counting, 

 and also that their stems were longer, or at least they had their whorls of leaves growing 

 higher on the stem, than those from shady habitat. — James P. Poole. 



438. Heusser, C. Over de voortplantingsorganen van Hevea brasiliensis Miill Arg. [The 

 reproductive organs of Hevea brasiliensis Miill Arg.] Mededeel. Alg. Proefsta. A. V. R. O. S. 

 [Medan, Sumatra] Rubberserie 24. 1919. — Reprint from Arch. Rubbercult. 3 : 455-515. 

 1919. 



439. Lecomte, Henri. Les canaux secreteurs radiaux du bois. [The radial secretory 

 canals in wood.] Compt. Rend. Acad. Sci. Paris 171:533-536. 1920. — Radial secretory 

 canals are present in Pinus, Picea, and Larix, but absent in 11 other genera of conifers. Six 

 genera of the Anacardiaceae are found with them and 2 without. Their occurrence in the 

 Burseraceae is problematical. In Spondias the radial canals are found to connect with the 

 longitudinal canals of the secondary wood but not with those of the pith. — C. H. Farr. 



440. Maas, J. G. J. A. De bloembiologie van Hevea brasiliensis. [The floral biology of 

 Hevea brasiliensis.] Mededeel. Alg. Proefsta. A. V. R. O. S. [Medan, Sumatra] Rubberserie 

 22. 1919.— Reprint from Arch. Rubbercult. 3 : 288-312. 1919. 



441. Resvoll, Thekla R. En utpraeget selvbest0ver. [A distinctly self-pollinated 

 plant.] Nyt Mag. Naturvidenskab. 56: 131-135. 4 fig- 1919. — Description of mode of self- 

 pollination of E-pilohium anagallidifolium Lam. by pressure of stamens against stigma. — 

 A. Gundersen. 



442. Salisbury, E. J. Botany. Sci. Prog. [London] 14:389-392, 572-575. 1920.— A 

 brief review of some of the more important recent papers on anatomy, cytology, morphology, 

 taxonomy, ecology and economic botany. — J. L. Weimer. 



443. Sotjeges, RenJ;. Embryogenie des Composees. Les premiers stades du developpe- 

 ment de I'embryon chez le Senecio vulgaris L. [The embryogeny of the Compositae. The 

 first stages in the development of the embryo of Senecio vulgaris.] Compt. Rend. Acad. Sci. 

 Paris 171 : 254-256, 356-357. 13 fig. 1920. — The embryo of Senecio in its early stages of 

 development resembles that of Helianthus. It is similar to other Compositae in the non- 

 formation of octants and in the formation of the hypocotyl from the basal cell of the two celled 

 embryo. — C. H. Farr. 



444. WissELiNGH, C. VAN. Bijdragcn tot de Kennis van de Zaadhuid. Zesde bijdrage: 

 Over de Zaadhuid der Onagraceeen en Lythraceeen. [Contribution to a knowledge of the 

 seed-coat. Sixth contribution: The seed-coat of the Onagraceae and Lythraceae.] Pharm. 

 Weekblad 57: 77-83, 125-1.39. PL 1, 10 fig. 1920.— In the Onagraceae and Lythraceae the 2 

 integuments and the innermost integument and the nucellus at first are separated. In the 

 Onagraceae, with the exception of Epilobium angustifolium, the cuticle generally disappears 



BOTANICAL, AB8TKACTS, VOL. VIII, NO. 1 



