As is explained in the Introduction, this book is intended for a strictly practical purpose - that of supplying the Student with such facsimiles of English mediaeval documents as the improvement in photographic processes has of late rendered possible: its form is further conditioned by the great preponderance in this country of documents of purely administrative origin. We are very well aware that our treatment of the subject is empirical: indeed we hope that we may have provided here the foundation for more detailed study and more definite conclusions in the near future.<br><br>The plan of the work was originally laid down by our colleague Mr. C. G. Crump. When he was prevented from following it up, the execution devolved upon us: but we have had the advantage of his help and advice throughout.