. A text-book on physiology : for the use of schools and colleges : being an abridgment of the author's larger work on human physiology. ed and dottedducts arise. In thesefibro-vascular tissues itfrequently happens thatthe fortifying thread isdouble or even quad-ruple. Of spiral vesselsderived from a cactuswe have an example inthe photograph, , and in those fromthe banana in that of Spiral vessels of cactus, magnified 50 diameters. p%n, 123. The spiral vessels of plants contain air. Other tubesare for the conveyance of liquid; the laticiferous ves-sels, for example, which are branching
. A text-book on physiology : for the use of schools and colleges : being an abridgment of the author's larger work on human physiology. ed and dottedducts arise. In thesefibro-vascular tissues itfrequently happens thatthe fortifying thread isdouble or even quad-ruple. Of spiral vesselsderived from a cactuswe have an example inthe photograph, , and in those fromthe banana in that of Spiral vessels of cactus, magnified 50 diameters. p%n, 123. The spiral vessels of plants contain air. Other tubesare for the conveyance of liquid; the laticiferous ves-sels, for example, which are branching tubes for trans-mitting the latex of plants. Again, in other cases, theinterior of the vessel is more or less completely filled upby a gradual deposit of solid material, it being in thismanner that proper woody fibre is formed from long,spindle-shaped cells. Vascular tissue in coniferous plantspresents a peculiar dotted aspect from disc-like forms,exhibiting a pair of concentric circles, which are set at How does vascular tissue arise? What are spiral vessels? Whatare reticulated and dotted ducts? What is represented in Fig. 124 ?. ANIMAL VASCULAR 123. 333
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Keywords: ., bookautho, bookcentury1800, bookdecade1860, booksubjectphysiology
