The Use of Copper Sulphate as an algicide and disinfectant in water supplies has been tried practically under so many conditions that definite data regarding it are gradually becoming available. The conclusions drawn from the experience to date by Dr. George T. Moore, who first suggested this procedure, are as follows: Much less copper is required to eradicate algae from reservoirs than is necessary to destroy them under laboratory conditions. The effect of the sulphate on fish is of considerable importance and requires more study. The physical and chemical constitution of a water are factors to be considered in determining the quantity of sulphate to use. The elimination of organisms causing pollution sometimes makes possible the development of other species, but so far the latter have never been the cause of complaint. As a result of the sudden destruction of great numbers of algae, there is sometimes an increase in the odor and taste of the water for a few days immediately after its treatment with copper or sulphate. Under certain conditions the sulphate may be used to great adantage in connection with filtration.

The world uses at least 170,000,000,000 matches yearly.

A barrel of crude petroleum is 42 gallons, or 5.9146 cubic feet; a barrel of refined petroleum 50 gallons, or 6.684 cubic feet. ,

No place on earth is immune from earthquake- A short time previous to the Charleston earthquake, the city of New York was visited by a slight but very no ticeable shock.

Theoretically, a miner working underground requires only 6 1/2 cubic feet of fresh air per minute for respiration, the absorption of moisture, and the dilution of carbonic aacid gas. This, however, assumes that all air after having been breathed is immediately removed, without mixing with the surrounding atmosphere, a condition impossible to fulfill.

A piece of granite measuring 60 by 30 by 14 feet has recently been quarried at South Ryegate, Vermont, establishing a record.

The amount of steam that may be made with coal depends upon the coal itself, and also upon the conditions under which it is burned. Another important factor is the man who is doing the firing. An inexperienced man can easily waste coal by either too little or too much stoking. Overfeeding the fire results in intense heat, causing waste by blowing off of the safety Valve, When fuel is again added to the fire in unnecessarily large amount it temporarily deadens the fire and the steam goes down, only to rise again when the fire burns brightly. Coal making a large percentage of ash is not so good as that making less.