An experimental inquiry into the cause of the ascent and descent of the sap : with some observations upon the nutrition of plants, and the cause of endosmose and exosmose / by G. Rainey.

  • Rainey, G. (George), 1801-1884.
Date:
1847
Catalogue details

Licence: Public Domain Mark

Credit: An experimental inquiry into the cause of the ascent and descent of the sap : with some observations upon the nutrition of plants, and the cause of endosmose and exosmose / by G. Rainey. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    communicate, some of the joints are even isolated from the rest, but at a later period, their parietes, where they lie in contact, become removed by a process of absorption, and a free communication is estabhshed between them. Sometimes the openings by which they communicate are circular, with a distinct border, at others the coils of spiral fibre are partially absorbed, and separated as shewn in Plate 1, Figs. 3, 4, 5, and 6. 39. The vascular bundles of a leaf are continued into its petiole, and from thence they pass into the stem, where they become dispersed, some are continuous with the spiral vessels situated around the pith, and others with the vessels of the layer of wood last formed. These vessels, in their passage through the bark, are contained in large canals, situated between the liber and the cuticle, in which they appear to lie naked—See Plate 1, Fig. 7. Some of the vessels in the petiole do not pass directly into the stem, but either become intermixed with a quan- tity of loosely connected cells, see Plate ii. Fig. 8, or anastomose with the vessels of the adjacent bundles. These can be very well seen in the Fig-tree, by making a vertical section through the petiole at its insertion into the stem. The canals which transmit the vessels appear to be continuous with spaces of various sizes, continued all along the bark of the stem, and situated at different distances from the surface. Their walls, or immediate boundaries consist of rows of cells piled one row upon another j sometimes they are smooth, and at others they are covered with small whitish granules. Many of the passages seem to become filled up more or less completely vvith clusters of new cells, which have a pale greyish tint,