The Effect of Certain Colloidal Substances On the Growth of Wheat Seedlings ..

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Such an arrangement exposes a large surface to a steady stream of water and there fore makes a very efficient dialyzer. As we were unable to obtain a sufficient amount of the parchment paper tubing for all the work with silica, a modified Stern dialyzer was also used. This consists of two pans each of about five liters capacity arranged so that a stream of distilled water comes in at the bottom of one, fills the pan and overflows evenly at the top. The other pan has parchment paper drawn tightl...y over the top and tied, and a hole made in the bottom large enough to insert a funnel. This pan is placed upon the first pan bottom up so that the parchment paper comes in contact with the water in the first pan. Dialysis begins at once when the mixture of sodium silicate and hydrochloric acid is put in the top pan. A few short pieces of filter paper laid between the two pans help to establish a uniform distribution of the water as it flows from the pan. About five liters could be dialyzed at one time with this apparatus which requires a period of nearly three weeks 208 DAVID STOUT JENNINGS with the water running continuously.

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