CALLINICUS A DEFENCE OF CHEMICAL WARFARE OTHER VOLUMES IN THE TO-DAY AND TO-MORROW SERIES DAEDALUS, or Science and the Future _By J. B. S. Haldane_ ICARUS, or The Future of Science _By Bertrand Russell, F.R.S._ THE MONGOL IN OUR MIDST _By F. G. Crookshank, M.D._ New light on Man and the Great Apes. _Fully Illustrated_ WIRELESS POSSIBILITIES _By Prof. A. M. Low_ Wireless in war, crime, business, and pleasure. _With 4 Diagrams_ TANTALUS, or The Future of Man _By F. C. S. Schiller_ Man has still the primitive animal passions. He will destroy himself, unless.... THE PASSING OF THE PHANTOMS _By Professor Patten_ Experiments on animals’ intelligence throw light on the evolution of morals in men and animals. LYSISTRATA, or Woman and the Future _By Anthony M. Ludovici_ PERSEUS, or Of Dragons _By H. F. Scott Stokes, M.A._ NARCISSUS, An Anatomy of Clothes _By Gerald Heard_ E. P. DUTTON & COMPANY CALLINICUS A DEFENCE OF CHEMICAL WARFARE BY J. B. S. HALDANE _Sir William Dunn Reader in Biochemistry, Cambridge University_ _Author of “Daedalus or Science and the Future,” etc._ [Illustration] NEW YORK E. P. DUTTON & COMPANY 681 FIFTH AVE. Copyright, 1925 By E. P. DUTTON & COMPANY _All rights Reserved_ PRINTED IN THE UNITED STATES OF AMERICA CALLINICUS The public mind has to a large extent reacted against the opinions impressed on it during the war by official propaganda. Some of these have been overcome by counter-propaganda in the Press and on the platform; others have been dropped because they led to effects which, though admirable during a war, were undesirable in peace-time. But, as chemical warfare will not assume importance until the outbreak of the next serious war, and figures on the programme of no party, people still think about it as they were told to think by the newspapers during the Great War. Now, I am to some extent a chemist, so I can no more be expected to be impartial in my estimate of the value of chemistry than a politician or a clergyman can be expected to give an unbiassed view of the value of politics or religion. I can only plead that, unlike the average clergyman or politician, I have warned my audience in advance, and shall attempt (though no doubt vainly) to be impartial.