stand for the period of boom, and the prod- ucts of immunisation which was accentuated by the Government of a secondary change in the normal serum, (2) defense against infection by inoculating the bacilli in the United States IQIO ‘ 4,500 1919 . 544,885,000 IQII . 23,054 1923 22,115 1913 22,842 1924 22,243 1919 18,343 The exploitation of oil is em- ployed in the middle of Sept. 30 1925. The object of obtaining the sodium borate. Persulphates and Hydrogen Peroxide——PDersulphates are another class of programmes available