. The American entomologist and botanist. stals 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 nitrate of lime, a solution of oxalate ofpotash, and carefully washing the precipitate,selected on a filtering paper: trying on thisoxalate of lime the reactives above mentioned,I found them verified. So it may be stated thatth
. The American entomologist and botanist. stals 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 nitrate of lime, a solution of oxalate ofpotash, and carefully washing the precipitate,selected on a filtering paper: trying on thisoxalate of lime the reactives above mentioned,I found them verified. So it may be stated thatthese crystals are oxalate of lime. Soine ncedlc-sliai)cd crystals I subnnttcd to a careful stu<lywith the following result: I took for object therasping of the root of Sarsaparilla {Smilax Sar-sa par ilia). By the addition of a drop of waterwc find in the middle of a ring of starch glo-bules a fascicle of needle crystals, and near byyou find other needles whose points are brokenand scattered in the vicinity. (Fig. JI.), a).mt:. -Jir,.]. In a longitudinal slice of the same root, youmay remark between the porous cells and thestarch cells a long line of these needle-sha))edcrystals, whose points all look in one directionand follow one another like a procession of antsgoing to the hillock. (Fig. 215, b). At first Ithought—there we have cells with crystals likethe Cactus and (ieranium cells, and 1 suspectedsome porous cells to be the home of these crys-tals. Error! I analyzed the rasping of the root 350 THE AMEEICAN without water; I could not find any needles ora trace of a crystal. In the heap of starch Iremarked a transparent rippled object which Ithought was the source of the crystals. 1 thenpoured a drop of water between the objectglasses, but the same object was not changed;in moving the object I found near by the wellconstituted needles, where there was nothingof that kind belore. I repeated several times the same experiment,and saw finally the needles take their origin of
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