260 BOARD OF AGRICULTURE. [Jan., 



we passed from the crude ore through ever_y stage of the 

 process, to the giving us of a coin as a souvenir. It was 

 copper, of course. The machinery was especially interesting. 

 Some of it was so finely made that it could be adjusted to a 

 thousandth part of an inch, so that a bar of copper being put 

 through a roller would be changed a thousandth part of an 

 inch. I cannot stop to dwell upon these processes, but they 

 were as interesting as anything could possibly be. I said to 

 one of the gentlemen connected with that exhibit : " How 

 does it happen that all this part of the building is given over 

 to a representation of the United States Mint? How is it that 

 Uncle Sam can spare all this machinery?" "Why," he said, 

 " there is about to be installed in Colorado an auxiliary mint 

 of the United States government, and it happened that this 

 machinery was perfected just about the time that the exhibition 

 opened. So this machinery was sent to St. Louis and set up, 

 and after the fair closes it will go to Colorado to be installed, 

 and will not again be on exhibition." It was indeed a happy 

 circumstance that the installation happened to come just about 

 the time of the fair. 



Passing on a short distance from the mint we came to an 

 exhibit of the wireless telegraph system. There was a lec- 

 turer in attendance, who was one of the brightest men I ever 

 met. He gave us in detail the entire history of the wireless 

 telegraph apparatus. I was told at the time the particular 

 difiference or distinction between the transmitting medium 

 which they are obliged to use in the wireless system and tlmt 

 used in the X-rays. As you pass through the lecturer on the 

 X-rays explains the various details, and so you go through the 

 entire process, witnessing all of the illustrations, and being 

 subjected yourself to those tests. This gentleman, who was 

 our special attendant, said that when he was illustrating the 

 X-rays he always liked to get hold of a lady's pocketbook. 

 He said he found everything in it but money ; that there was 

 always plenty of tickets, books, checks, and samples of cloth, 

 etc., but very seldom money. We tried it on the ladies in my 

 party, but they did not have a pocketbook. He put a rubber 

 l3and around my hand, and by holding a pin on the inside, like 

 that, was able to locate where it was. So that if a pin was 

 really in your hand the surgeon could locate it exactly, or any 

 other foreigfn substance. X-ravs have been considered as 



