288 MORPHOLOGY, ETC., VASC. PLANTS [BoT. Absts., Vol. VIII, 



gonacees. Developpement de I'embryon chez le Polygonum Persicaria. (Embryogeny of the 

 Polygonaceae. Development of the embryo in Polygonum Persicaria.) Compt. Rend. Acad. 

 Sci. Paris 168: 791-793. 1919 (see Bot. Absts. 5, Entry 5S1).] Bet. Gaz. 68: 486. 1919. 



2005. Cutting, E. M. [Rev. of: Church, A. H. On the interpretation of phenomena of 

 phyllotaxis. Bot. Mem. [Oxford] 6. 68 p. 1920 (see Bot. Absts. 9, Entry 337).] Sci. Prog. 

 [London] IS: 148. 1920. 



2006. Gatin, V. C. Recherches anatomiques sur le pedoncule et la fieur des Liliacees. 

 [Anatomical investigations of the peduncle and flower of the Liliaceae.] Rev. G6n. Bot. 32: 

 561-591. Fig. 56-60. 1920.— The final chapters of the investigations previously reported are 

 here given. They comprise a study of the subfamilies Dracenoideae and Colchicoideae 

 together with a summary of the relationships within the Liliaceae, and between this group 

 and the neighboring families Juncaceae, Dioscoreaceae, Haemodoraceae, Amaryllidaceae, 

 and Iridaceae as far as such relationships are shown by the anatomy of the peduncle and 

 flower. — /. C. Gilman. 



2007. Gravis, A. Connexions anatomiques de la tige et de la racine. [Anatomical connec- 

 tions between stem and root.] Bull. Acad. Roy. Belgique, CI. Sci. 1919^: 227-236. 1919.- 

 There is no true transition between these organs. The union of the conducting strands in the 

 2 regions is brought about (in young plants) by means of special cell groups (triads) composed 

 of 1 group of centripetal vessels situated between the 2 halves of a fibro-vascular bundle con- 

 sisting of centrifugal wood. At a level above this point, the 2 halves unite and the centripetal 

 vessels disappear. At a lower level it is the centrifugal wood which disappears, and the bast 

 bundles alternate with the centripetal wood strands. The author has studied various types 

 of triads, and suggests solutions for the problems of the circulation of water in the young 

 plant, the morphological value of the single cotyledon of monocotyledons and the evolutionary 

 origin of these plants, the character of the so-called pseudo-monocotyledonous plants, the 

 origin of the structure of stem and root from the point of view of phylogeny, and the signif- 

 icance of the triads. — Henri Micheels. 



2008. Haan, H. R. N. de. Contribution to the knowledge of the morphological value and 

 the phylogeny of the ovule and its integuments. Recueil Trav. Bot. N^erland. 17: 219-322. 

 Fig. 1-12. 1920.— The structure of the ovule and in particular of its integuments is described 

 in detail for the fossils Lepidocarpon, Miadesmia memhranacea, Lagenostoma Lomaxii, Sphae- 

 rostoma ovale, Physostoma elegans, Trigonocarpus Parkinsoni, Mitrospermum covipressum, 

 and Bennettites; and (in living plants) for 7 genera of cycads, for Ginkgo, for 8 genera of coni- 

 fers, and for 3 of Gnetales. Ovular characters are critically compared throughout this wide 

 range of plants in an attempt to determine the evolutionary history of the ovule and in partic- 

 ular of the integumentary structures. The author suggests that the most primitive type 

 appears in Physostoma, where the units constituting the integument are most clearly evident. 

 Progressing upward in the plant series these units become less and less clearly recognizable. 

 The double integument, which makes its first appearance in the Gnetales and which occurs in 

 the angiosperms, is discussed, and several suggestions to account for its origin are brought 

 forward. The author concludes that the integuments of pteridosperms, gymnosperms, and 

 (probably) angiosperms are homologous structures. The integument of these forms bears 

 no relation to the indusium of ferns.— J. C. Th. Uphof. 



2009. Hall, Harvey Monroe, and Thomas Harper Goodspeed. A rubber plant sur- 

 vey of northwestern North America. Univ. California Publ. Bot. 7: 159-278. PI. 18-30. 

 8 fig. 1919.— See Bot. Absts. 8, Entries 2010, 2011, 2248. 



2010. Hall, HarveyMonroe, and Thomas Harper Goodspeed. Chrysil, a new rubber 

 from Chrysothamnus nauseosus. [Part II of : Hall, H. M., and T. H. Goodspeed. A rubber 

 plant survey of northwestern North America.] Univ. California Publ. Bot. 7: 183-264. PL 

 18-20, 6 fig. 1919.— The present paper undertakes to deal with "Chrysil," the rubber prepared 



