Since the announcement of this article, and before, _Collier's_ has been in receipt of much virtuous indignation from a manufacturer of remedies which, he claims, Liquozone copies. Charles Marchand has been the most active enemy of the Douglas Smith product. He has attacked the makers in print, organized a society, and established a publication mainly devoted to their destruction, and circulated far and wide injurious literature (most of it true) about their product. Of the relative merits of Hydrozone, Glycozone (Marchand's products); and Liquozone, I know nothing; but I know that the Liquozone Company has never in its history put forth so shameful an advertisement as the one reproduced on page 28, [IMAGE ==>] {028} signed by Marchand, and printed in the New Orleans _States_ when the yellow-fever scare was at its height. {031} And Hydrozone is an "ethical" remedy; its advertisements are to be found in reputable medical journals. The Same Old Fake. Partly by reason of Marchand's energy, no nostrum in the country has been so widely attacked as the Chicago product. Occasional deaths, attributed (in some cases unjustly) to its use, have been made the most of, and scores of analyses have been printed, so that in all parts of the country the true nature of the nostrum is beginning to be understood. The prominence of its advertising and the reckless breadth of its claims have made it a shining mark. North Dakota has forbidden its sale. San Francisco has decreed against it; so has Lexington, Ky., and there are signs that it will have a fight tor its life soon in other cities. It is this looming danger that impelled Liquozone to an attempted reform last summer. Yet, in spite of the censorship of its legal lights, in spite of the revision of its literature by its scientific experts, in spite of its ingenious avoidance of specifically false claims in the advertising which is being scattered broadcast to-day, Liquozone is now what it was before its rehabilitation, a fraud which owes its continued existence to the laxity of our public health methods and the cynical tolerance of the national conscience. IV--THE SUBTLE POISONS. Reprinted from Collier's Weekly, Dec. 2, 1006. {032}