JOURNAI. AND PROCEEDINGS, 105 
source. The other chemicals already experimented with would not 
transmit radio-activity, but, on the discovery of Radium the rays 
travelled far and wide, and would stop at nothing. They would pen- 
etrate cloth, glass, and the chemicals on a photographic plate, and 
would not stop there. Radium rays went with ease through sub- 
stances where uranium shafts failed to penetrate. And in their 
rooms, the discoverers of Radium found there were three degrees of 
rays—-one that stopped at and would not penetrate paper ; the second 
that pierced paper and failed to pass a magnet on the other side, 
and the third and most powerful that pierced both paper and mag- 
net and was strong enough to print on a photographic plate. 
In the cure of human ailments, Radium would prove a valuable 
factor. When physicians and scientists realized the disassociation 
of the link from the link in the human body, and understood the 
proper application of the rays of light and heat, the substance could 
be used. 
In a light-proof box a diminutive quantity of Radium inter- 
mixed with fifteen grains of other chemicals was passed around the 
audience. ‘The powder was sealed ina glass tube, and by looking 
into the box the rays radiating from the chemical could be seen. 
The powder seemed to be highly phosphorescent, and the two chem- 
icals mixed would hardly fill a thimble. The Radium contained 
there, little as there was, is the first ever seen in Hamilton, and is 
the property of J. R. Collins, Toronto. This little tube has been 
in Paris, New York, Toronto and other places, and when it is remem- 
bered that there are only four ounces of Radium in the world, its 
value can readily be perceived. It is in the temporary possession 
of Rev. Dr. Marsh and J. M. Williams, and these gentlemen 
made a few interesting experiments with the rays. They placed an 
exposed camera in a dark room facing a photo of Saturn, made by 
Mr. Jenkins, of this city, the only light being that proceeding from 
the powders contained in the tube. The exposure was of seven 
hours’ duration, and the plate being developed it was found that 
the radiating light had been sufficient to make a fine impression of 
the view contained in the original photo. ‘This view, with a few 
others, including a photo. of Madame Curie, were shown by lantern. 
At the close of the lecture a hearty vote of thanks, moved by 
