Dr. Young begins by a review of the origin of slavery and gradual development of wage labor, following its thread through the rise and decline of the ancient empires of Egypt, Greece, and Rome. The conquest and carrying off of alien races for the uses of manual labor, while their conquerors followed the profession of arms, was the most fruitful source of slavery in ancient times. This species of slavery is still found in Africa. It was long ago extinguished in Europe. It was crippled in America by the suppression of the slave trade, and has finally disappeared in the United States by the emancipation of the negro race. On the other hand, we have never had in this country the predial slavery which is bound to the soil and digs the ground it originally sprang from, of which the last great example is vanishing from Russia under the benignant edicts of Alexander II. But there is no doubt that that form would have developed itself in the United States from negro slavery if the distinction of color could have been annihilated. It was already tending in that direction when the war intervened. We must pass over Dr. Young’s account of labor under the feudal system, but we cannot help noting the prejudice he seems to share with the vulgar against the monks. To read his pages, one would necessarily be led to infer that the clergy were among the worst oppressors of the poor; that they ground their unhappy serfs, and were the allies of the nobles and military commanders in keeping down the working classes. That all this _farrago_ of calumny is directly the reverse of the truth is now so universally admitted by students of those ages that it is needless to enter into the question, nor would our space permit us to do so. It will suffice to quote Hallam, who, while opposed to the principles upon which monasteries are founded, calls those of the middle ages “green spots in the wilderness where the feeble and the persecuted could find refuge.”[28] And again, speaking of the devastation of immense tracts by war, he says: “We owe the agricultural restoration of the great part of Europe to the monks.”[29] It is singular that such testimony is omitted by Dr. Young. It would be still more singular if it had escaped his observation. His admissions are as ridiculous as his omissions. In a foot-note of a single line, which is lost in the midst of two chapters on the subject, he says: “It is admitted that the abbots were most indulgent landlords.” This is as if a writer on the woollen manufacture of the present day should devote a hundred pages to the knitting-needles of the old women in our country towns, and inform his readers in a one-line footnote: “Steam machinery was also used in this age in the manufacture of woollens.” The monastery was as distinctively the economic feature of the civilization of the middle ages as the steam-engine is of our times. Each played the same part in its development. It is just as easy to be blind to one as to the other.