The Crusades furnish the subject of frequent popular disquisitions and, sketches, but the laws by which the Crusaders lived in their promised land have rarely, if ever, been popularly sketched in this country. This brief notice may do something toward supplying this desideratum, and at the same time toward reconciling the most poetic reader--the greatest admirer of the institutions of chivalry--to having been born in this prosaic age, nearly a thousand years later. It may make such persons feel that even 'the glorious uncertainty of the law' has some advantages over the judicial processes of the kingdom of Jerusalem. But I must not close my article, as some in similar cases have done, without informing the reader to whom he is indebted mainly for it. I have myself often entered that hall in the Royal Library at Munich, and looked with interest upon that manuscript of the Assizes of Jerusalem, but I have never studied it. In the winter of 1858, however, I heard a course of popular lectures on various subjects, by a number of distinguished men, before an audience of invited ladies and gentlemen, at the lecture room of Baron von Liebig's chemical laboratory. One of these was delivered by Baron de Voelderndorff on the Assizes of Jerusalem. On opening my box of books, after my return from Europe a few weeks since, I came across a volume containing the course of lectures to which I have referred. As my eye rested upon this one, I remembered the interest with which I had listened to its original delivery, and resolved that the public should have a chance to feel something of the same. This article is the fruit of that resolution, and though not strictly a translation, may still be regarded as little more or less than such, and the credit given wherever the reader shall deem it due. FOOTNOTES: [1] Jurors, larceny, theft, murder. [2] Francis de Pitaval, born at Lyons, in 1673, gave this word to the judicial literature of Europe, by a work entitled 'Causes célébres et intêressantes.' [3] La haute cour. [4] Assises de la haute cour. [5] La chevalerie du royaume. [6] Bourgeois. [7] Cours de la chaine. [8] Cour de la fonde,--fonde signifying the place, probably, where traders came together. [9] 'Lettres du Sepulcre.' LETTERS TO PROFESSOR S. F. B. MORSE. LETTER I. LOYALTY AND SOVEREIGNTY.