Preliminary observations are generally uninteresting and undesirable: yet there are two points which suggest themselves as to the present work requiring a few words of comment. The first of these is, that it may be deemed almost unnecessary to produce another book upon a subject so thoroughly dealt with as the history of the Order of St. John has been by writers of high ability and reputation, especially in the comprehensive work of General Porter and the able summary of the Rev. F. C. Woodhouse. As the first mentioned of these valuable books, however, last saw the light in 1884, and the other appeared in 1879, the vast increase in the work and importance of the English Order since the spread of the Ambulance movement has excited a desire to know more about its rise and progress than either volume can satisfy; for the doings of the last ten years are the legitimate sequel of a chain of events dating back to the era of the first crusade, and the home of the Ambulance work in England is still that edifice which was originally founded for similar purposes in the twelfth century. This leads to the second observation, that little field for original authorship is left to be occupied. The statements of former writers have been repeatedly examined and tested; all that can be done at the present day is to repeat facts and to summarize narrative - to lead the reader to conclusions, by directing him to unimpeachable authorities.