. Principles of the anatomy and physiology of the vegetable cell. Plant cells and tissues. ANATOMY AND PHYSIOLOGY OF a layer of considerable thickness, and in wliicli no cellular tias yet been shewn to exist. E. CONTENTS OF CELLS. In the present state of our knowledge it is an impossibility to give even a tolerably complete description of the contents of eells, since of the large number of organic compounds produced by the vegetative processes, almost all of which occur in the cells, only a very small number can be demonstrated at present in the plant itself by means of the microscope, since m
. Principles of the anatomy and physiology of the vegetable cell. Plant cells and tissues. ANATOMY AND PHYSIOLOGY OF a layer of considerable thickness, and in wliicli no cellular tias yet been shewn to exist. E. CONTENTS OF CELLS. In the present state of our knowledge it is an impossibility to give even a tolerably complete description of the contents of eells, since of the large number of organic compounds produced by the vegetative processes, almost all of which occur in the cells, only a very small number can be demonstrated at present in the plant itself by means of the microscope, since most of them occur in solution in the cell-sap and in too small quantity for them to be rendered visible by re-agents. I must, therefore, confine myself to the mention of the organized productions found in cells, and the universally diffused substances. a. Frimordial Utricle, Protoplasm and Wucleus, In all young cells, whatever their subsequent contents may be, whether they persist in the stage of cells or become changed into vascular utricles, a series of formations are met with, which dis- appear again more or less perfectly in the subsequent periods of life, and which stand in the closest relation to the origin and growth of the young cell, but only in particular cases in relation to their later functions. If a tissue composed of young cells be left some time in alcohol, or treated with nitiic or muriatic acid, a very thin, finely granular membrane becomes detached from the inside of the wall of the cells, in the form of a closed vesicle, which becomes more or less contracted, and consequently removes all the contents of the cell, which are enclosed in this vesicle, from the wall of the cell. Reasons hereafter to be discussed have led me to call this inner cell (fig. 43, a) the primordial ^'^^' ^^' utrideipQ^imordialschlauch) (H. V. Mohl, " Remarhs on the Structure of the Vege- table Cell/'—Bot Zeitung, 1844, 273. Transl. in Tay- lor's Scientific Memoirs, vol. iv. p. 9
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectplantcellsandtissues
