1. Mikrochemisches Praktikum, II. Auflage, München 1931, S. 62 ff.,F. Emich-F. Schneider, Microchemical Laboratory Manual, New York 1932, p. 68.
2. Sometimes there are two filtersticks to be weighed at the same time, e. g.,O. Michajlowa, S. Pevsner undN. Archipowa, Z. analyt. Chem.91, 25 (1932).
3. E. g., in carrying out weighings during molecular weight determinations by theRast-Pregl method.
4. They can be obtained fromPaul Haack, Wien IX; or Microchemical Service, Douglaston, N. Y.
5. F. Emich, l. c., S. 25–38.F. Emich-F. Schneider, l. c., pp. 27–40.H. Alber, Mikrochemie14, 219 (1934).