What I found surprising was that even in 1944 the listings are full of weasel words and qualifying phrases, presumably to avoid legal action. A book "purports to reveal." The names of sachet powders "are not indicative of any power they may possess, but act as distinguishing trade names." I had thought these sorts of disclaimers were products of 1960s-1970s consumer protection laws. I guess they were around much earlier. I'd be interested to know when the tide changed. Similar ads from the 1910s came right out and said "the book reveals."
Link to the book:
Masters Occult Catalog No. MCMXLIV