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In this paper the principal consideration has been the relative results that may be secured with flames produced from different gases, without consideration of how these data may influence the design of appliances. A number of manufacturers are already making use of this information and are making changes in their burners to secure higher effi-ciency, greater flexibility, and increased safety of operation. AcknowledgmentThe author wishes to express his appreciation for the advice and suggestions of Walter M. Berry, gas engineer of the Bureau of Standards.

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All drawings should be made with India ink, preferably on tracing cloth. If co6rdinate paper is used, blue must be chosen, as all other colors blur on reduction. The larger squares, curves, etc., which will show in the finished cut, are to be inked in. Blue prints and photostats are not suitable for reproduction. Lettering should be even, and large enough to reproduce well when the drawing is reduced to the width of a single column of THIS JOURNAL, or less frequently to double column width. Authors are requested to follow the SOCIETY'S spellings on drawings, e. g., sulfur, per cent, gage, etc.