vided with a platinum-tipped jet and is arranged for every adjustment. The lime cylinder can be revolved and raised or lowered. The jet may be adjusted rela tively to the lime so as to secure the best results. As the gases are mixed inside the burner they should be taken from tanks or cylinders in which considerable pressure is maintained. Gas bags are unsafe when used in connection with a burner of this kind. In the electric lamp shown in Fig. 7 a Jablochkoff candle is employed. It is superior to the calcium light and gives very little trouble when an alternating cur rent is available. The carbons being presented end on to the object yield nearly all their light in one direc tion so that the loss of light is less than in the case of the ordinary arc lamp. The candle is coincident with the prolongation of the axis of a helix supported near the luminous point. The current that supplies the candle passes through the helix. In consequence of this the arc is drawn to the end of the candle in oppo sition to its tendency to follow the carbon rods. The candle can be moved forward as it is consumed by grasping the insulating handle at the rear end. Elec trical contact is established with the rods by two cop per springs contained in the revoluble support of the candle. When a direct current is used a quick-acting current-reversing switch is required as in this case the current must be reversed frequently to cause the car bons to burn evenly. Memphis Artesian Wells. count of the discovery of artesian wells in this city. We have also given the analysis of the water by Dr. Charles Smart Major and Surgeon U. S. Army Wash ington D. C.; Prof. J. W. Mallett of the University of Virginia ; Prof. E. H. Bailey of the Chemical Labora tory of the University of Kansas all aLtesting its remarkable purity. The city of Memphis has been enjoying this water now for nearly one year using from eight to ten million gallons daily and there are no signs of exhaustion of the wells. The increased de
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