138 T. MANSELL — THE EOTTGEN OE "x" EATS. 



Little now remains to say, except that it must appear to everyone 

 that this discovery is of great importance, especially for surgery, 

 because it gives one a means of seeing the interior of the body. 



The amount of knowledge that has been acquired during this 

 century upon scientific subjects is very much greater than in all 

 previous centuries put together. I do not wish for a moment 

 to lessen the credit due to Rontgen in connection with the dis- 

 covery of which I have had the pleasure of showing some 

 illustrations this evening, but we must remember that Kontgen 

 simply worked upon a foundation laid by Lcnard, Crookes, Hertz, 

 Clerk Maxwell, Faraday, and others, and the most important thing 

 which he discovered was that bone was much less transparent than 

 flesh to the "X" rays. 



We know that knowledge, and the discoveries that make know- 

 ledge, do not proceed from single brains, but are subject, as is 

 everything else, to the law of evolution, and are the result of 

 the cumulative workings of many minds. 



[JSTumerous experiments were made by Mr. Mansell, and skia- 

 graphs taken at the commencement of his lecture were developed, 

 and lantern-slides made from them by Mr. F. Downer were shown 

 on the screen at the conclusion of the lecture, with many other 

 lantern-slides illustrating the subject.] 



