. Elementary botany. Botany. The funnel should be one with a short tulie, or the vessel one which is quite deep so that a small test tube wliich is filled with water may in this condition be inverted o\'er the opening of the funnel tube. With this arrange- ment of the experiment the gas will rise in tlie inverted test tube, slowly displace a portion of the water, and become collected in a sufficient quantity to afford us a test. When a consider- able quantity has accumulated in the test tube, we may close the end of the tube in the water with the thumb, lift it from the water and
. Elementary botany. Botany. The funnel should be one with a short tulie, or the vessel one which is quite deep so that a small test tube wliich is filled with water may in this condition be inverted o\'er the opening of the funnel tube. With this arrange- ment of the experiment the gas will rise in tlie inverted test tube, slowly displace a portion of the water, and become collected in a sufficient quantity to afford us a test. When a consider- able quantity has accumulated in the test tube, we may close the end of the tube in the water with the thumb, lift it from the water and invert. fig-65- Apparatus for col- The gas will rise against the thumb. A dry lecting quantity of oxygen from elodea. soft pine splinter should be then lighted, and UJ^tme''> after it has burned a short time, extinguish the flame by blowing upon it, when the still burning end of the splinter should be brought to the mouth of the tube as the thumb is quickly moved to one side. The glowing of the splinter shows that the gas is oxygen. 128. It is better to allow the apparatus to stand several days in the sunlight in order to catch a full tube of the gas. Or on a sunny day carbon dioxide gas can be led into the water in the jar from a generator, such an one as is used for the evolution of The CO., can be prociuced by the action of hydrochloric acid on bits of marble. The CO,, should not be run below the fun- nel. The test-tube should be fastened so that the light oxygen gas will not raise it off the tun- nel. A\'ith the tube full of gas the test for oxygen can be made by lifting the tube with one hand and. 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 Atkinson, George Francis, 1854-1918. New York : H. Holt
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