But without knowing enough of the minute and intimate history of these people, to point out precisely on what part the distress for want of food chiefly fell, and to what extent it was generally felt, I think we may fairly say, from all the accounts that we have of nations of shepherds, that population invariably increased among them whenever, by emigration or any other cause, the means of subsistence were increased, and that a further population was checked, and the actual population kept equal to the means of subsistence, by misery and vice. For, independently of any vicious customs that might have prevailed amongst them with regard to women, which always operate as checks to population, it must be acknowledged, I think, that the commission of war is vice, and the effect of it misery, and none can doubt the misery of want of food. CHAPTER 4 State of civilized nations--Probability that Europe is much more populous now than in the time of Julius Caesar--Best criterion of population--Probable error of Hume in one the criterions that he proposes as assisting in an estimate of population--Slow increase of population at present in most of the states of Europe--The two principal checks to population--The first, or preventive check examined with regard to England. In examining the next state of mankind with relation to the question before us, the state of mixed pasture and tillage, in which with some variation in the proportions the most civilized nations must always remain, we shall be assisted in our review by what we daily see around us, by actual experience, by facts that come within the scope of every man's observation. Notwithstanding the exaggerations of some old historians, there can remain no doubt in the mind of any thinking man that the population of the principal countries of Europe, France, England, Germany, Russia, Poland, Sweden, and Denmark is much greater than ever it was in former times. The obvious reason of these exaggerations is the formidable aspect that even a thinly peopled nation must have, when collected together and moving all at once in search of fresh seats. If to this tremendous appearance be added a succession at certain intervals of similar emigrations, we shall not be much surprised that the fears of the timid nations of the South represented the North as a region absolutely swarming with human beings. A nearer and juster view of the subject at present enables us to see that the inference was as absurd as if a man in this country, who was continually meeting on the road droves of cattle from Wales and the North, was immediately to conclude that these countries were the most productive of all the parts of the kingdom.