142 
BURHELL : DROPPI^'G WELL AT KNARESBOROUGH. 
430 of water, or 162 grains per gallon (parts per 70,000). This water 
is, therefore, not far short of being a saturated solution of Calcium 
Sulphate or Gypsum. The amount of dissolved Carbon Dioxide in 
the water, by means of which the Calcium Carbonate is kept in 
solution, is small, and it is probable that this, in conjunction with 
the very large quantity of dissolved Calcium Sulphate, are the main 
reasons for the petrifactive action of the water. Tins, however, 
cannot be properly decided without a careful analysis of the sinter, 
which the writer hopes to carry out at some future period. 
It has been shown that the water is but slightly affected by 
atmospheric variations of temperature, it is therefore reasonable to 
suppose thit it rises from a considerable depth, and from its com- 
position it must have percolated througli strata containing a 
considerable amount of gypsum. In various places in Yorkshire I 
believe deposits of this substance have been found in the Permian 
strata, but I am unable to say whether they have been noticed at 
Knaresborough. 
BiBLlOaRAPHY. 
1. Leland's Itinerary. 
2. Camden's Britannia. Edition published 1607. 
3. Spandarine Anglica, or the English Spaw Fountain. Edm. Dean 
London, 1626. 
4. Cures without Care . . . .by virtue of Mineral 
Waters near Knaresborough. Michael Stanhope, London, 
1632. 
5. The Yorkshire Spaw: Or, a Treatise on Four Famous Medicinal 
Wells .... near Knaresborough, in Yorkshire. 
John French, M.D., 1654. 
6. Spadacrene Eboracensis : Or, the Yorkshire Spaws, near Knares- 
borough : Being a Description of Five famous Medicinal 
Wells. By Geo. Neale, M.D., 1656. 
7. Ralph Tlioresby, the Topographer. By D. H. Atkinson, Leeds, 
1885. 
8. The Natural, Experimental, and Medicinal History of the 
Mineral Waters of Derbyshire, Lincolnshire, and Yorkshire. 
By Thomas Short, M.D., London, 1734. 
