1. An attempt was made to read and cite references from as many original sources as possible. These are indicated by giving the first and last pages; if the paper consisted only of a single page, the word “only” follows the page number. References taken from another source contain only the first page. References marked with an asterisk (*) refer to material copies of which were obtained from the Zechmeister files in the Archives of the R. A. Millikan Memorial Library, California Institute of Technology, Pasadena.
2. K. Maček (Prague). Personal communication (1978).
3. “Chromatography—A Review of Principles and Applications”;Lederer,1955