ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 775 



aud JR. semper jlor ens) are generally scentless. In the BanJcsia group, 

 B. Batiksia alba possesses a very pronounced odour of violets, while 

 JR. Banlisia lutea has no marked odour. The Cinnamomese, with one or 

 two exceptions, do not possess a strong odour, and the Pimpinellifolise are 

 likewise almost scentless. In the Villosse the flowers are nearly scent- 

 less, but the leaves are glandular, and omit an odour of terebiuthin 

 {R. villosa). TLe section Buhiginosae are also remarkable only on 

 account of the peculiar perfume emitted by the leaves of several species. 

 The author then describes in detail the tissues inclosing the fragrant 

 principle. lu the petals the essential oil resides in the cells of the two 

 layers of the epiderm ; its presence may be easily detected by using 

 osmic acid. 



Odour of the Glands in Rosa.* — M. F. Crepiu calls attention to the 

 interest connected with the substances contained in the glands of different 

 species of Bosa, which deserve closer observation than they have at pre- 

 sent received. He points out that the odour of the substance contained 

 in the glands of the sweet-briar [B. rahiginosa) and of the species nearly 

 allied to it which make up the section Kubiginae, is totally different from 

 that of all other species of the genus. 



(3) Structure of Tissues. 



Laticiferous Tubes. f — Mr. P. Groom has investigated the distribu- 

 tion of laticiferous tubes, with reference to their function, in several 

 species of Euphorbiaceas, Papayacea), Artocarpese, Asclepiadese, and 

 Compositfe. Ho finds that the tubes may be distributed throughout the 

 whole of the leaf, and may end in contact both with the epiderm and the 

 mesophyll. In some leaves the endings of the tubes are chiefly in con- 

 tact with the ej)iderm ; in others chiefly or exclusively away from it. 

 In the leaves the tubes may leave the assimilating tissue altogether, as 

 they do in the Artocarpete, when they pass through the aquiferous tissue 

 to the epiderm. There is, therefore, no essential connection between 

 the endings of the laticiferous tubes and any particular tissue of the 

 leaf. From these facts the author draws the conclusion that no conduc- 

 tion of carbohydrates takes place through the laticiferous tubes, as has 

 been supposed by some, this process being effected, in the leaves, mainly 

 through the parenchyme of the veins. 



Vesicular Vessels of the Onion. |— Mr. A. B. Eendle finds that the 

 structures which go by this name are not correctly so-called, being 

 enlarged cells in which no cell-fusion has taken place. He proposes 

 that they should be termed in future laticiferous cells. Their resem- 

 blance to sieve-tubes is simply structural ; in the great majority of 

 instances the pits in their walls are not perforated. With regard to 

 their function, they contain no ordinary food-material, and have no 

 connection either with the assimilating parenchyme or the vascular 

 bundles. Their contents is a more or less granular turbid fluid of the 

 nature of latex, aud must probably be regarded simply as an excretory 

 product. 



Intercellular Spaces in the Tegument of the Seed of Papilionaee8e.§ 



— Dr. 0. Mattirolo aud Sig. L. Buscalioni find in the tegument of the 



* CR. Soc. R. Bot. Belgique, 1889, pp. 64-7. 



t Ann. of Bot., iii. (1889) pp. 157-68 (1 pi.). J T. c, pp. 169-77 (1 pi.). 



§ Malpighia, iii. (1889) pp. 143-59 (1 pi.). 



