614 KANSAS CITY REVIEW OF SCIENCE. 
ceptibly heated quite as much as by a gas flame that gives a larger amount of 
light. 
The conditions which affect the purity of the same air of a room are, how- 
ever, not all the same in the case of lamps or candles as those which prevail 
when gas is used. In the case of the lamp or candle, the wick either draws up 
the hydrocarbon on which it depends for its light by capillary attraction, or else 
this hydrocarbon is forced up the wick at a uniform rate by an equable pressure. 
In the case of gas it is usually different. The gas comes from a street main, in 
which the pressure is constantly varying, partly in consequence of the continual 
variation which takes place in the number of lights in use. For instance, if a 
large shop suddenly lights up its establishment, a sudden decrease of pressure 
would occur in the neighboring houses. In order to obtain sufficient Hght in a 
neighboring house, it might be necessary to turn the cock of the burners full on. 
When the hghts in the shop are extinguished, the pressure would be suddenly 
increased, and the gas would be forced through the burners more rapidly than it 
could be consumed, consequently, much impurity might be forced into the house 
in the shape of unconsumed gas. It is therefore necessary to regulate the pres- 
sure at which the gas reaches the burners and many of the complaints of the 
impurity of the air of a room, caused by gas, arise from this want of regulation 
of pressure. The pressure can be regulated by the use of a governor placed 
either at the meter or in proximity to the light itself From these various con- 
siderations it is apparent that the more perfect the combustion is in the artificial 
light, the less it will affect the purity of the air in a room ; but so long as the 
light is burned in contact with the air of a room, the air will be more or less 
affected. — Builder. 
ARCHEOLOGY. 
RECENT ARCH^OLOGICAL DISCOVERIES IN NEW MEXICO. 
J. C. COOPER, TOPEKA, KANSAS. 
Traveling in New Mexico a few weeks ago, I had the pleasure of meeting 
Mr. Amado Chaves, Superintendent of Public Schools for the Territory of New 
Mexico. He resides at San Mateo, in Valencia County, and I incidentally 
learned from him that he had made an archaeological discovery that appears to 
me to be a very interesting one. 
His home, San Mateo, is situated twenty-five miles north of Grant Station 
on the Atlantic and Pacific R. R. About a mile from his house there is a large 
sand-hill, which he has ridden over hundreds of times, and it had not appeared 
to possess any special interest, until a few weeks before I met him, he was pass- 
