After Professor Black was gone, or that other wise man from the East, the handsome and distinguished-looking editor of the _Engineering and Mining Journal_, Mrs. Gano would agitate the great red rocking-chair into an abortive rock, and lifting her chin with an air of disdain: "Humph!" she would say, "a mighty superior person!" Then, seeing her son would not respond to this obvious irony: "Who is he, to quarrel with the Bridgewater Treatises!" "Black is too accurate a thinker to accept the theory of design carried to the highest perfection." And, hoping to stem the tide of further objurgation of his friend, he would demolish the _Treatise on the Human Eye_. "So far from its being the nicest adaptation of means to an end, the eye of man is a clumsy and pitiful production." This was the kind of irreligion that in these days excited Mrs. Gano's ire more than any other. So hot would the argument grow, that sometimes her son would utterly lose sight of his determination never to disturb his mother's faith. He would turn upon her with all the enthusiasm of the passionate amateur. "One glance through the magnifying-glass at the infinitely superior eye of the common house-fly is enough to--" "Enough to make any Christian thankful, I should say, that his eyes are what Providence made them." "The fly's eye is a far finer instrument." "Humph! A pretty sight we'd be with protruding goggles bigger than all the rest of the face!" "I assure you the fly has a beautiful eye! And then the way it is placed! Magnificent! A group of powerful lenses mounted on rods, controlled by delicate muscles that turn the eye about so that without moving his body he can see all round him. _There_ was an invention if you like!" "I shouldn't have liked it in the least." "Ah, that's because you don't realize that to examine certain insects through the magnifying-glass is to dispose at once and forever of the notion than an omnipotent Providence did His level best by man. As a mechanical contrivance the human eye is merely an intricate failure." Then, perhaps perceiving that these intricate failures in his mother's head were shooting lightnings, he would shield his audacities behind a foreign authority. "Helmholtz says he would be ashamed of any novice in his laboratory who should design so poor an optical appliance." "Just like his German impudence! A nation of boors and atheists!" John Gano would always end by pulling himself up, and accepting these strictures on his authorities and his friends (and by implication on himself) with a silent tolerance.