Publisher's Synopsis
Excerpt from The Carbon Dioxide of the Soil Air: A Thesis Presented to the Faculty of the Graduate School of Cornell University for the Degree of Doctor of Philosophy
The cylinders illustrated in figure 44 were used in the first experiment. These cylinders, eight in number, were made of galvan1zed iron, coated inside with'a layer of paint to insure their being air-tight at the joints and to prevent rusting. They were 3_feet 'high by 1 foot in diameter, and' each-had a cone-shaped bottom leading to the cocks on the outside as indicated in figure 45.
The cone-shaped bottom was filled with gravel, above which was placed a 12-inch layer of soil from the second foot of the field soil. Above this was placed a foot of surface soil. The soil used was Dunkirk clay loam. The moisture in the soil was maintained thruout the course Of the experiment at 30 per cent On the oven-dry basis. The soil was covered with a half-inch layerof quartz sand in order to reduce the evaporation, the sand being added to the cropped soil immediately after seeding. The dry weight of the Soil in each of the cans was pounds.
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