“You might wish to follow some one without being seen. If the object of your chase should turn a block ahead, you would not have to follow. You could simply stand on the corner, hold your little box back at an angle of about twenty degrees—in this manner—and it would bring every object on that street to your eyes. “If you are suspicious of your best girl, and want to watch the other fellow while he calls on her, don’t sneak up to the house and peep through the window. Take your little Look-Back, place this end to the keyhole and your eye at the other and the entire surroundings will be disclosed. “The little box which you see in my hands has within it such a combination of lenses and glasses, all arranged in such a scientific way, that they throw a picture of objects to the center of the box, where they are exposed to the eye. “If you want to watch an eclipse you can do so with this little Look-Back; and if you want to sight the smallest thing at the longest distance, there you have it. And, by the way, if you want to gaze on the smiling countenance of your best girl without using the keyhole, or being seen, just place yourself directly under her window, use this little instrument, and I don’t care if she lives forty stories high you can spot her every time. “The bad boy got hold of one of these and discovered a new use for it. He looked through the wrong end at a lamp post, and found that it turned the post upside down. Would you believe it, gentlemen, after that he stood on the street corner, gazing at the passers-by, and had every man, woman and child walking upside down. “Of course, I don’t want any of you to do the same thing, because it would be unfair and wouldn’t be nice. “Now, before I begin to hand them out, I wish to show you an article that is related to the Look-Back, and, in fact, goes with it. It is a microscope—not like the ordinary ones, but one that magnifies one hundred thousand times larger, according to its size and power, than anything that has ever been discovered. It is something every man should own, from the fact that he can make it pay for itself a thousand times over. “In buying your groceries, for instance, you can discover any and all adulterations by its aid. The same with the water which you drink—any impurities in it can be easily seen. “If you buy a suit of clothes, the microscope comes in handy again, for by its aid you can find out whether your clothes are all wool, or mixed with cotton. If you need a sunglass, or want to do anything which requires an acuteness of sight beyond the limit of the human eye, you can be assisted by the microscope. “There are a thousand and one other uses for this little instrument, but you all know what it is and it is needless for me to go into any further statement of its merits.