Abstract
When dry bags of rubber, gold beaters'skin, parchment and collodion, each containing olive oil and Sudan III, are separately immersed in olive oil, and the remaining conditions of the environment are uniform, diffusion of the pigment promptly occurs through rubber, but does not take place at all through any of the other three membranes. When the bags are lifted from the oil, washed externally with ether, and then immersed in ether, 2 the pigment quickly passes through the rubber, but diffuses very slowly if at all through the remaining membranes.
Successive immersions of moist impermeable membranes (gold beaters'skin and parchment) in alcohol and ether, for different periods of time, fail to render the treated membranes more permeable to Sudan III under the conditions of the experiments already described.
The authors demonstrated the general facts in this connection pertaining to rubber and gold beaters'skin.
Experiments along these lines, with additional membranes, pigments and liquid media, are in progress, in an effort to obtain further knowledge of the functions of membranes in diffusion.
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