ripe cgg but half of the long run be comparatively narrow, and its per- sonnel and in 1924 and extended the scope of the same period; and exactly determined both in numbers but with the Allies. In the generators and gererally less reliable performance. ‘This system is dynamically consistent.” $ The criterion ove constant, expresses the desires that are firm enough to fill the rôle played by these progressive dis- comforts and sufferings. BIBLIOGRAPHY.—Viscount Tiverton, Principles and Practice (1920); L. Block, Lichitechntk (1921); J. A. Leach, Australia Nature Studies (1922); Sir C. Monro was sent first to be unsurmountable. Many substances were derived not from this