In response to our inquiry &ressed to the Aluminum Co., the follow in^ information was receiwed: We have in our possession a pattern, from which a t various times, castings similar to the one you mentioned, have been made. We also know that a number of these castings were presented to members of the American Chemical Society who visited our plant a t New Kensington in 1892. It stands to reason, then, that if Dr. Remsen was among the party which visited the plant, in that year, he was probably given one a t that time. We have no record of the names of the men who made that visit, and we also know that similar castings have been made abroad. It is therefore impossible to positively identify this plaque as one that was cast here, although circumstantial evidence makes me believe that it was. OR AMERICA ALUMINUM COMPANY W. C. WHITE PITTseuRoH. PA.
COMMERCIAL MATERIAL FOR SCIENCE CLASSES* It would seem from an occasional letter which we receive that our name appears in your JOURNAL among a list of firms who are willing to sendmaterial of interest and value to instructors of chemistry in the various schools throughout the country. This has been interpreted in many cases to mean that we have samples of materials showing steps in manufacture, etc. As a matter of f a d , the only material which we have is printed matter such as our catalog on Reagents and "C. P.'s," which we publish from time to time. Will you therefore kindly edit the note in your esteemed JOURNAL in accordance with this information. MERCK& Co., INC. C. S. ROBERTSON KA~WAY N., J. 'See abstracts from Scimce Classroom (Sept., 1928). THISJOURNAL, 5, 1350 (Oct.
1928); 6, 158 (Jan., 1929).
