To return to the physical properties of the material. In may show still further likeness. One remarkable character istic of copal is its power of becoming more soluble in alcohol after first melting it with as little heat as possible when upon resolidification it is found much more easily soluble. its solubility in alcohol chloroform benzole and turpen tine. In alcohol it is quite insoluble after a week's digestion a little coloring matter only being taken up. In chloroform it is to refuse to dissolve. In benzole it is partially soluble though not nearly to the extent of the chloroform solution. In turpentine its solubility appears to lie between benzole In all the three last cases a portion only of the gum dis of a series of different and distinct resins having preferen tiful glossy film not easily scratched through so as to reach. something of the nature of beeswax might be contained in the substance dissolved. The varnish with turpentine had a decided advantage over the others in tenacity. to shellac as a photographic protective varnish; but further treatment with an alkali may take from the kauri gum that principle which causes the surface gloss of the varnish to be so destructible. We may conclude our notice of this very lead; indeed we have met with no varnish superior to them Steam Economy Again. Your correspondent S. W. Robinson in your issue of gine. In the process of calculation there referred t and the consumption indicated by its terminal pressure and increased terminal pressure for a given load or diminished recognized as the factors used in the calculation are the ones affected by clearance. It was the loss which is occasioned when the exhaust or terminal pressure is greater than the return or counter pressure which was referred to as restored I was not attempting to give the conditions necessary 'for steam used' but merely discussing a method of calculating actual diagram whether favorably or unfavorably condi tioned Hence there is no conflict between
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