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[[preprinted]] 162 [[/preprinted]] [[margin]] Protal [[/margin]] [[red vertical line in margin]] and which gave him the idea that my A might help him out making his Proton [[Protal]] by water. Says it costs him 3 1/2 cents per lb. to make. I advised him either to dip in liquid A and bakelize a coat with Varnish stack and dry. Or simply use his vegetable ivory as a filter in conjunction with solid A or B or liquid or partly A. [[underlined]] explained him everything.[[/underlined]] He took careful notes. I gave him some samples of A and liquid A we had managed to save [[end page]] [[start page]] 163 [[red vertical line in margin]] in fire. The powdered A was in 3 or 4 flat little tin boxes. the liquid A in a pint tin can cylindrical. Ditto the varnish stock. Later on Thurlow went back to laboratory and [[strikethrough]] [[recreated?]] [[/strikethrough]] succeeded in getting a chunck of A from that A up stairs which was in tray in photographic room and which had undergone some melting. In order to make sure whether this A was still A I tried it before Wiechmann and Thurlow with a lighted match. Wiechmann left here [[end page]]