It will be seen that I have been very sparing of references to my authorities. This has been partly due to a belief that my readers will in most cases share my dislike to a text encumbered with notes; but partly also to the peculiarities of the special case. The great majority of the authorities are now inaccessible to most readers. I have consulted scores of tracts that very few people could possibly procure. Besides those in my own pos session, or in possession of my relatives, very many have come under my inspection through the cour tesy of friends with whom my articles had brought me into correspondence. To one correspondent, whose connexion with the Brethren dates back to 1845, I am under obligations that I find it quite impossible to adequately acknowledge. Not only has he placed at my disposal a set of tracts that is, I should suppose, almost unrivalled for the period 1845-70, but he has taken the greatest pains to clear up, by the help of private correspondence, various obscurities that I have submitted to him. For the later period, my own resources have been very ample. Instead of constant references, I have furnished at the end of the book a sufficient bibliography, chronologically classified. In one or two instances only, I have mentioned books that I have not succeeded in consulting. On the other hand, I have omitted very many that I have not found of much service, and on the sole authority of which I have stated nothing.