FAIRLEY : BLOWING WELLS. 
419 
mouths of the fissures. At the nearest cutting- near Northallerton 
it is found at a depth of about 400 feet. 
The following is analysis of sandstone taken near the water 
level from the blowing well at Solberge, near Northallerton, 
April, 1880. 
The stone, when fresh is soft and pliable. Strong hydrochloric 
acid applied to the stone disintegrates it with effervescence. 
An analysis of the stone after partial drying by free exposure 
to the air gave the following numbers : — 
Moisture ... ... 
1-25 (by difference) 1-27 
Silica 
87-72^1 
Peroxide of Iron (traces of Alumina) 
396 
*Lime .. 
3 58 ; 
\- 98-73 
*Magnesia 
0-32 
1 
Carbonic Acid 
3-15, 
1 
Sulphuric Acid 
trace 
Loss .. 
0-02 
100-00 
100-00 
At the well at Langton Hall I have made only qualitative 
experiments. It is a disused well ; the water being foul and un- 
wholesome. On one occasion I visited this well there was a 
strong down current, readily shown by the smoke from a cigar, 
held at the crevices of the flags covering the well. On the second 
occasion when I visited Langton the current was in an opposite 
direction, blowing up a handkerchief spread over the loose joint 
of the flags. On this occasion I lowered a candle to the bottom 
of the well, and it burned clearly at the bottom. This circum- 
stance when we remember that the well has not been in use or 
disturbed for years is important. The water from this well was 
exceedingly foul, and smelt offensively. On analysis it was found 
to be practically sewage. 
These wells at Langton and Solberge are about five miles 
apart, situated on the rising ground separating the valleys of the 
* These give 7*05 of Carbonates of Lime and Magnesia. 
