In the past two years a highly original infrared sampling technique has been developed. This is probably the most constructive method of solid state sampling yet devised. It has been found possible by making dilutions of organic solids in solid potassium bromide and with subsequent pressing to prepare disks of these materials which are visually clear and of known concentration of weight so that they can readily be placed into the spectrophotometer without the usual difficulties and interferences resulting from solvents or nujol mulls. This method was developed independently by Sister Miriam Michael Stimson of Siena Heights College in this country (2), and by Dr. U. Schiedt of the Max Planck Institute for Biochemistry in Tübingen, Germany (1). The latter has been able to investigate this method more in detail and to develop it to a greater extent. Some of these results and developments are the object of this report.
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