106 THE HAMILTON ASSOCIATION, 
Adam Brown and seconded by Ald. Findlay, was tendered Mr. Wil- 
liams. The owner of the tube was also thanked for the loan of it. 
Mr. Jenkins, F. R. A. S., made a few remarks, in the course of 
which he declared that Radium might possibly settle vexed ques- 
ions of perpetual motion and the material of which the sun was 
composed. 
The half-tone of Saturn accompanying this article is one of the 
slides shown at the lecture, being one of the first radiographs pro- 
duced in Canada, and was made at the observatory of Dr. Marsh, 
who produced it in this way: He placed a sensitive Illford lantern 
plate in direct contact with the negative copy of the drawing ; these 
together were put in the camera, and a small tube containing 1 gram 
of Radium (240 radio-activity), the property of and kindly lent by 
Mr. J. R. Collins, Toronto. The tube was placed inside the camera 
in the position of the inner lens of the camera; the bellows was 
then drawn until the Radium and plate holder were three inches 
apart ; the slide of plate holder was drawn, and the sensitive plate 
exposed to the Radium light for thirteen hours. On being developed 
this picture of Saturn was the result. The drawing of the planet is 
the work of G. Parry Jenkins, F. R. A.S., of Hamilton. Mr. 
Jenkins drew the planet at the eye-piece of his own telescope in 
Wales, in 1895. ‘The telescope was a 5-inch Wray. This drawing 
has been favorably commented on by astronomers of note. The 
shadow produced by the ball on the rays is especially well defined, 
which is only possible by the astronomer choosing the proper year 
in which to observe it. It was worthy of being the object to be 
first reproduced to demonstrate the power of Radium. 
Rey. Dr. Marsh presided, and the attendance was large, stand- 
ing room being hardly obtainable. 
