H2 
and of Bicycle Riding,” illustrated by diagrams. The 
paper dealt with historical types of bicycles, the principle 
of the tension spoke wheel, tangent spoke, the friction 
of bearings and chain, air resistance, hollow tubes, etc. 
Pace-making, gearing, long and short cranks, were also 
touched upon. 
A specimen of the Red-billed Chough (Pyrrhocorax 
graculus), shot near Hendon ; a Common Teal, male, in 
winter plumage, from East Finchley ; and a Dabchick 
from the Welsh Harp, were exhibited by the Hon. 
Secretary on behalf of Mr. Whiting. 
On the 2nd March, 1900, Mr. E. C. Crump read a 
paper entitled ‘‘ Nature’s Forces,” illustrated by experi- 
ments. The incompressibility of water, gravitation, cen- 
trifugal force, inertia, density of air, etc., were dealt with. 
The Hon. Secretary exhibited and made remarks upon 
a specimen of the Common Bittern (Botaurus stellaris), 
shot near the Welsh Harp on 8th December, 1899. 
On the 6th April, 1900, Mr. Frederick Womack, 
M.B., B.Sc., gave a lecture on ‘‘ Wireless Telegraphy : 
Its History and Development,” illustrated by experi- 
ments and lantern slides. Sir W. H. Preece’s tentative 
experiments and method of sending signals without 
overhead or submarine connecting wires, were first 
described. The so-called ‘ ether-waves” were explained. 
Photographs of Ampére, Faraday, Henry, Clerk Maxwell, 
Lodge, Righi, Preece, Marconi, and others were shown, 
and the work that each had done in_ connection 
with wireless telegraphy was detailed. _ The lecturer 
described how ether waves had been measured, reflected 
and refracted, and how the oscillations were set up. By 
means of a Branley ‘“‘coherer,” a bell at the opposite 
