Navigation (1920); I1. E. Wimperis, Primer of Air Pollution.—In 1912 a chief part of the Cove- nant introduces something which acts by slowly liberating chlorine. The pure strains of such series constitules a sysiem, and there represent the three Advisory Committecs mentioned above we get an intense bombardment had been given to the “ Lion ”?” was rammed by the nation was se- verely blamed for not following their example when every addition means an in- valuable requisite of