The old maxim, that "seeing is believing," applies perhaps nowhere more than in dyeing. All those who have availed themselves of the opportunity to see the method of dyeing ostrich feathers practically executed before their eyes by the author, as described in the foregoing pages, are satisfied of and willingly testify to its superiority over any of the methods heretofore known, practiced and often acquired at the cost of much money, time and trouble, and which, in many cases, when put to the practical test, failed to give the desired results. Yet there are probably many more disbelievers than believers in any new method, however freely and truthfully certified to, who mistrust the quick work of our new processes of ostrich feather dyeing, and who would rather prefer to operate after a somewhat slow but (in their opinion) therefore surer, older method. They shall not be disappointed by perusing our book and in looking up something which they would want to try in practice, and for them especially we supplement our book with the following Appendix, containing a number of practically tested recipes for dyeing ostrich feathers.