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 be in the market for the products advertised, but from anyone who wishes further information in any way bearing on the subjects of which the advertiser has presumably made a special study.

Readers who make it a point to avail themselves of such invitations accumulate and absorb a fund of almost invaluable information in this way. Every advertiser is a source of live data on live subjects—and at all times ready to give the beneﬁt of his research and experience to anyone who is legitimately interested.