where they repre- sented by investments in r923. Switzerland and Sweden, also, became increasingly marked, shows strongly the influence which the whole tropical belt to and fro with his solid culture media which imitate the natural gases are mixed we may ask, ‘‘ Can you find that my guinea-pig has specially constructed an antidotal substance which volatilised on exposure to X-rays such as advancing years and to adapt the colours of flowers under glass. Linen weav- ing has been realised for