. Agricultural news. Agriculture -- West Indies; Plant diseases -- West Indies. 191 THE AGEICn/lVIIAL NEWS. Ji m 19, 1915. is so injurious as the accompanying rise in tempi ture. At the same time il is always desirabli to keep the carbon dioxide confenl al a minimum ii onh because of the consideration that fresh air rend- ers animals more immune to diseases like tuberculosis. Another subject which receives attention is the ecoitomj of small farm gas engines. These machines are now being commonly employed on estates in the tropics, but it may not be gener- ally known that engines develop their
. Agricultural news. Agriculture -- West Indies; Plant diseases -- West Indies. 191 THE AGEICn/lVIIAL NEWS. Ji m 19, 1915. is so injurious as the accompanying rise in tempi ture. At the same time il is always desirabli to keep the carbon dioxide confenl al a minimum ii onh because of the consideration that fresh air rend- ers animals more immune to diseases like tuberculosis. Another subject which receives attention is the ecoitomj of small farm gas engines. These machines are now being commonly employed on estates in the tropics, but it may not be gener- ally known that engines develop their best fuel ?economy not at their maximum load, but at a load approximately 7 per cent, of the maximum load. In America the draft of waggons has also received much investigation. The invention of a now form of dynamometer has enabled interesting curves to be obtained showing the variation in the horse power exerted on roads of different surfaces and grades over long distances. This work is being continued, and within the next few years a sufficient number of observations will have been made to allow of the deduction of very general conblusions. One question that i- being studied is the effect of the width of tyres on draft. In this connexion it may be pointed out that in regard to carriages, a rubber tyre necessitates the expenditure of greater energy in starting and stopping than does an iron tyre. Most planters in the West Indies recognize thai there is need for the investigation of draft work locally, particularly in connexion with the relative efficienc} for different draft purposes of cattle and mules. The lasl phase of agricultural engineering which we ma} consider is the teaching "i the subject. For agricultural student, most authorities agree thai a tli« itical beginning should:consist oi a study of mechanics, and that a practical start should consist of work in the forge and in the carpenter's shop. On the farms attached to agricultural colleges and experiment i Io
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