It is, likewise, true that Messrs. Tiffany, Bogert and Rechert in their "Historical Notes"[B] undertook to rescue the Nesbitt die varieties from an ignominious oblivion, and for this they are also entitled to praise, but up to the most recent time, the great body of collectors did not possess a guide-book, a "Philatelic Baedeker," which would enable the timorous traveler to proceed into the unknown country with a feeling of perfect safety. Naturally the question arises: What is the reason for this state of affairs? Why have the Nesbitt die varieties been relegated to an entirely unmerited obscurity? Unless I am greatly mistaken the answer is that the large majority of collectors believed the subject to be fraught with difficulties. Add to this both the lack of a catalogue and of any systematic exposition of the early die varieties, and it is easy to comprehend why the bugbear has continued to the detriment of United States philately. However, thanks to the good services of the Scott Stamp & Coin Co., and the J. M. Bartels Co., this wrong impression has been largely removed and the future collector of the Nesbitt dies has a rich and inviting field now open for his favorite pursuit. Moreover, henceforth no collection lacking these important die varieties can lay a claim to a full degree of completeness, and this remark refers equally to those who collect entire envelopes or cut square specimens. Indeed, of the two the latter is by far the larger gainer, because these varieties appear on comparatively few "knives" or shapes of envelopes. Assuming that not many collectors, either young or old, have busied themselves with die varieties a few remarks about the method or way of studying them, gained from practical experience, may not be out of place. Of course, I do not intend to give specific rules here. These will be in order as soon as we take up a special issue. It is true that die varieties may be found in half a dozen different ways, but it is equally plain that if we can use a uniform method, applicable to all, we shall be far better off. Although this fact is self evident, such a method was unknown when the writer commenced the study of the Nesbitt die varieties. Recognizing, however, the value of some simple means, various methods were pursued until, after numerous disappointing failures, the solution of the problem was found by means of line prolongation and the use of a unit distance measurement.