War is a grim teacher; and he must be unobservant, indeed, who fails to note the numerous facts of profound scientific importance which its concomitants and consequences have instilled into the mind. This is true in the domain of disease quite as well as in other fields in which science holds sway. For the physician, gaseous chlorin had only the remotest interest at the period when the war broke out. Today poisoning with the gases used like chlorin in warfare offers a serious problem to those entrusted with the management of "gassed" victims.
Not only the actual performances on the field of battle but also the diverse preparatory processes that make possible warfare of the ultramodern sort harbor hitherto unsuspected or underestimated menaces to human health. To take proper cognizance of them means not only to prolong life and alleviate suffering in hundreds of instances, but also to promote efficiency