Messengers of Force by D. H. Wilkinson , F.R.S. Professor of Nuclear Physics. at the Clarendon Laboratory, Oxford The problem of action at a distance-the way in which forces are propagated through even a vacuum-is an intriguing one. The idea that there is no agency is abhorrent to the physicist and in getting round the problem he postulates that there is some sort of particle involved. In the case of electrical and nuclear forces these particles have been identified, but what about the phenomena of magnetism and gravity?

A gardening weekly introduced by Roy Hay
James Bruce describes some of the main jobs that can be done in the garden during May
Fred Streeter 's
Choice:
Digitalis Excelsior
W. F. Bewley once again gives listeners the benefit of a gardening doctor's experience

A weekly magazine
Arranged and introduced by Bill Hartley including
100 What?: Petrol Octane numbers explained and discussed by Sinclair Ault
How to find your way about: some further notes on map reading by William Cave
The Lawyer: Stickers and mascots Silverstone: A report from the circuit on today's final practice sessions and prospects for tomorrow's Daily Express Trophy meeting, by Nevil Lloyd
Tips on the care of your car: Springs The week's motoring news and other items of topical interest
Edited by H. Saunders-Jacobs