. The American entomologist and botanist. of ponds and stillwaters, and sometimes called Duckweed. Tlie>-vary in size from one-twclf(h to one-quarter ofan inch, consisting of a simple leaf-like bodywith slender roots emitted from the undei- sur-face. They rarely i)roduce flowers in thiscountry, the usual mode of reproduction beingby the development of small, bulb-like bodiesfrom the edge of the leaves; these bulbs sink tothe bottom of the water in the fall, and rise tothe surface for development in the spring. TheBowers, when they do appear, are produced froma slit or opening in the edge of
. The American entomologist and botanist. of ponds and stillwaters, and sometimes called Duckweed. Tlie>-vary in size from one-twclf(h to one-quarter ofan inch, consisting of a simple leaf-like bodywith slender roots emitted from the undei- sur-face. They rarely i)roduce flowers in thiscountry, the usual mode of reproduction beingby the development of small, bulb-like bodiesfrom the edge of the leaves; these bulbs sink tothe bottom of the water in the fall, and rise tothe surface for development in the spring. TheBowers, when they do appear, are produced froma slit or opening in the edge of the leaf; theyare reduced to the simplest state, one or twoproducing a single stamen, and one or two asingle pistil. The VVolftia is a plant of similar nature, ofmicroscopic size and simpler structure, eachplant producing a single flower of stamen andpistil, formed by a small cup-like depression inthe body of the leaf or iilant.—Eu.] CELLS. ItY DU. l-ELIX SCHAAN, CHICAGO. 1> A U T III.— CoNli/i Hill from pagi ). Oxalate of Lime in < uctiis. 3. Crystals. In the vegetable cells we oftenfind crystals of oxalate of lime; they crystalizein form of (piadratic octahedrons. It is seldomwe find this octahedron well developed; yousee a large heap of plates agglomerated irregu- larly one to the other. lu Cactus you find themin every slice. Ucranium presents also a largeamount of cells containing crystals. (See ) Schlciden says that oxalate of lime crystalscan Lake also the form of needles. I had somedoubt whether all necdle-shaiied crystals wereoxalate of lime, and, on incjuiring, I went tothe following statements. The crystals of oxa-late of lime in the Cactus, I treated with nitricacid. It was not dissolved entirely, but cor-roded oidy on the edges. I added a drop ofammonia, and I saw that the crystal disap-peared rapidly, leaving several gas bubbles. 1 made a precipitate of oxalate of lime bydouble decomposition, by pouring into a solu-tion of nitra
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