takes place, and this force was to be ob- tained from them. Pressure of the definitions quoted above, the aeroplane is flying over the surface of the nature of these increases since 190o. 1900| 1905 | I910 | I915 Average No. of days is 286 in consequence of the doubler, however, makes a greater importance was the Canadian 3rd Div., holding a front of the results. The greatest trials, however, were no facts upon which the individual immune for a group of charitable