59 
surface of the water was quite warm, while the deeper parts were 
cold. Getting on towards Cortina, they had the rock Serapiss, 
which is not unlike a Roman amphitheatre. In some parts of 
that mountain the stones were dislodged by chamois, causing 
considerable danger to man. The roads were well kept, of 
which some 120 miles are down hill, but bicycling through such 
a country was not to be recommended. The scenery was so 
beautiful that one ought not to travel at a greater pace than a 
walk. The Lecturer showed a large number of views of Cortina 
and district, and concluded his most interesting lecture by a 
series of climbing reminiscenses. 

WIRELESS TELEGRAPHY. 
Wir EXprrERIMENTS AND LANTERN VIEws. 
By Rev. J. R. RENDELL, B.A. 25th November, 1902. 
This was the second time the members had enjoyed an oppor- 
tunity of seeing experiments, illustrating the remarkable dis- 
covery of transmitting and receiving messages, without the use of 
wires. Elaborate preparations had been made by the Lecturer, 
who arranged a series of experiments, which were success- 
fully carried out. In one instance a small motor wheel was set 
spinning round, and in another an electric lamp was lighted by 
means of an invisible medium. The Lecturer traced in outline 
the history of the discovery of Wireless Telegraphy, and gave a 
résumé of the labours of scientific men who shared in the honour 
of the discovery, and the important part played in it by the use 
of the invisible medium, ether. By slides and experiments he 
showed how the electrical disturbances of ether were set up, and 
the instruments that were employed for detecting them. There 
were electrical, molecular, and Rontgen waves. The waves of 
ether were not disturbed in passing through houses, water, or a 
town, and their amplitude depended on the knobs of the 
apparatus. 
