DEAR ORION,--At 12.20 this afternoon a line of movable types was spaced and justified by machinery, for the first time in the history of the world! And I was there to see. It was done automatically--instantly--perfectly. This is indeed the first line of movable types that ever was perfectly spaced and perfectly justified on this earth. This was the last function that remained to be tested--and so by long odds the most amazing and extraordinary invention ever born of the brain of man stands completed and perfect. Livy is down stairs celebrating. But it's a cunning devil, is that machine!--and knows more than any man that ever lived. You shall see. We made the test in this way. We set up a lot of random letters in a stick--three-fourths of a line; then filled out the line with quads representing 14 spaces, each space to be 35/1000 of an inch thick. Then we threw aside the quads and put the letters into the machine and formed them into 15 two-letter words, leaving the words separated by two-inch vacancies. Then we started up the machine slowly, by hand, and fastened our eyes on the space-selecting pins. The first pin-block projected its third pin as the first word came traveling along the race-way; second block did the same; but the third block projected its second pin! “Oh, hell! stop the machine--something wrong--it's going to set a 30/1000 space!” General consternation. “A foreign substance has got into the spacing plates.” This from the head mathematician. “Yes, that is the trouble,” assented the foreman. Paige examined. “No--look in, and you can see that there's nothing of the kind.” Further examination. “Now I know what it is--what it must be: one of those plates projects and binds. It's too bad--the first test is a failure.” A pause. “Well, boys, no use to cry. Get to work--take the machine down.--No--Hold on! don't touch a thing! Go right ahead! We are fools, the machine isn't. The machine knows what it's about. There is a speck of dirt on one of those types, and the machine is putting in a thinner space to allow for it!” That was just it. The machine went right ahead, spaced the line, justified it to a hair, and shoved it into the galley complete and perfect! We took it out and examined it with a glass. You could not tell by your eye that the third space was thinner than the others, but the glass and the calipers showed the difference. Paige had always said that the machine would measure invisible particles of dirt and allow for them, but even he had forgotten that vast fact for the moment. All the witnesses made written record of the immense historical birth--the first justification of a line of movable type by machinery--and also set down the hour and the minute. Nobody had drank anything, and yet everybody seemed drunk. Well-dizzy, stupefied, stunned.