. The plant, an illustration of the organic life of the animal. Biology. 66 THE TISSUES OF PLANTS Museum of the College of Surgeons, London, aU the prin- cipal varieties of the deposit of sclerogen are classified and described under the name of hard tissues, and contrasted with bone and teeth which form the hard tissues of ;* Earthy deposits sometimes occur in the cells of plants in the form of crystals or raphides. These consist of inor- ganic matter, generally of some acid and its base, which Pig. A portion of the outer layer of tlie bulb of Seilla marttima, having acicnlar
. The plant, an illustration of the organic life of the animal. Biology. 66 THE TISSUES OF PLANTS Museum of the College of Surgeons, London, aU the prin- cipal varieties of the deposit of sclerogen are classified and described under the name of hard tissues, and contrasted with bone and teeth which form the hard tissues of ;* Earthy deposits sometimes occur in the cells of plants in the form of crystals or raphides. These consist of inor- ganic matter, generally of some acid and its base, which Pig. A portion of the outer layer of tlie bulb of Seilla marttima, having acicnlar [raphides in some of its cells. has united and crystallized in the cells. There is nothing surprising in the existence of these' crystals. We know that acids are formed in the vegetable organs, and these unite with the earths or bases taken up by the roots from the soil, whilst they are suspended in the cell-sap. These * " Lectures on Histology, delivered at the Boyal College of Sur- geons of England, in the session 1850-51, by John Quekett. ;. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Coultas, Harland, d. 1877. Philadelphia ; Perry and Erety
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