A survey was made of the discolorations occurring in Sitka spruce wood, and toughness tests were made on specimens that included discolorations of unknown or doubtful significance.
During the routine determination of the vitamin contents of dehydrated foods, it was observed that nicotine acid values were often lower than expected. The methods of extraction of the food samples were therefore studied, together with the manner of preparation of the assay medium in an effort to secure optimum...