The weaker side of human character was, in all its aspects, manifest enough to his humorous perceptions. In an amusing paragraph in the _Autobiography_, he tells us how once in his youth he irresolutely adhered to his vegetarian scruples, even when his nose was filled with the sweet savor of frying fish, until he recollected that he had seen some smaller fish removed from their stomachs. Then thought he, "If you eat one another, I don't see why we mayn't eat you." "So convenient a thing," he adds, "it is to be a _reasonable creature_, since it enables one to find or make a reason for everything one has a mind to do." On another occasion, he was so disgusted with the workings of human reason as to regret that we had not been furnished with a sound, sensible instinct instead. At intervals, the sly humor dies away into something like real, heartfelt censure of his kind, especially when he reflects upon the baleful state of eclipse into which human happiness passes when overcast by war. Among other reasons, he hated war, because he deprecated everything that tended to check the multiplication of the human species which he was almost ludicrously eager to encourage. No writer, not even Malthus, who was very deeply indebted to him, has ever had a keener insight into the philosophy of population, and no man has ever been a more enthusiastic advocate of the social arrangements which furnish the results for the application of this philosophy. In one of her letters to him, we find his daughter, Sally, saying: "As I know my dear Papa likes to hear of weddings, I will give him a list of my acquaintance that has entered the matrimonial state since his departure." And in one of his letters to his wife, when he was in England on his first mission, he wrote: "The Accounts you give me of the Marriages of our friends are very agreeable. I love to hear of everything that tends to increase the Number of good People."[9] The one thing in French customs that appears to have met with his disapproval was the inclination of French mothers to escape the burdens of maternity. In a letter to George Whatley, he ventured the conjecture that in the year 1785 only one out of every two infants born in Paris was being nursed by its own mother.