. Principles of the anatomy and physiology of the vegetable cell. Plant cells and tissues. ' (t CoUenchynia cells from the stem of Beta^ vulgmis In the angles of the cellb the substance of their membrane (a) IS very hygroscopic, and swells np ^elatmously m WAter. made out wlietlier or not, in certain case^, for instance in tlie albnmen of ScMzolohmm excelsum {see Scliloiden on ^^ Albumen'' in the " JS^ova act Natm\ Curios'' xix. p. 11, pi. xliii, ^g 55), cells and intercellular substance originate together; but nothing can be decidedly determined about this, since we are altogether -witho
. Principles of the anatomy and physiology of the vegetable cell. Plant cells and tissues. ' (t CoUenchynia cells from the stem of Beta^ vulgmis In the angles of the cellb the substance of their membrane (a) IS very hygroscopic, and swells np ^elatmously m WAter. made out wlietlier or not, in certain case^, for instance in tlie albnmen of ScMzolohmm excelsum {see Scliloiden on ^^ Albumen'' in the " JS^ova act Natm\ Curios'' xix. p. 11, pi. xliii, ^g 55), cells and intercellular substance originate together; but nothing can be decidedly determined about this, since we are altogether -without observations on the develop- ment. In very many cases it is extraordinarily difficult to distinguish the in- tercellular substance from the cell-wall. In regard to this, my opinions differ in many cases from those of many other ob- servers ; for instance, of Schleiden, especially in re- lation to the structure of the cells which swell up in a jelly-lii:e manner in water (the so-called coUen- chyma-cells), which occur in the outer layer of the rind in many plants; for example, in Cuairhita Fepo, and Beta vulgaris (fig. 38), in which, accord- ing to my view, the parts swelling up (a) belong to the cell-membrane, and are formed of second- ary layers deposited in the angles of the cells; while, according to the opinion I formerly ex- pressed, still defended by Schleiden, the cells possess walls of uniform thickness, and the laminated mass lying between their angles is to be regarded as in- tercellular substance. In such difficult cases it is best to allow the cells to swell up in nitric acid, to render the stratification of their membrane more dis- tinct, and thus to make out the position of the primary membrane (^g. 39). linger ('^ Bokm. Zeitung," 1847, 289) has recently sought to demon- strate that the origin of the intercellular substance and of the cells is simultaneous. The reasons advanced by him do not seem to me convincing. In the present state of our knowledge, how
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectplantcellsandtissues
