108 Mr. Horner on the Brine Springs at Droltivlch, 



Or Muriate of soda . . . 96.48 per cent. 



Sulphate of lime . , , 1.63 



Sulphate of soda . . , 1.82 



Muriate of magnesia . , 0.07 



100.00 



By Exp. B. a. it has been shewn that three ounces of the brine 

 yielded by evaporation 431.86 grs. of entire salt, which is equal 

 to 143.95 grs. in one ounce. 



Before concluding this paper, I shall compare the results I have 

 obtained, with the accounts of the Cheshire Brine Springs, given 

 by Dr. Holland in his Agricultural Survey of that county, and 

 subsequently by Dr. Henry in the Philosophical Transactions 

 for 1810. 



The densities of the different brines in Cheshire and at Droitwich 

 are very nearly alike. In general, the former seem to contain 

 rather a larger proportion of pure muriate of soda. The Droitwich 

 brine is free from carbonate of lime, oxide of iron, and muriate of 

 lime ; all which are contained in that of Cheshire, though in very 

 minute quantity. But the most remarkable difference between the 

 two is, that the brine of Cheshire contains no sulphate of soda, 

 which I have found in that of Droitwich, in the proportion of 

 nearly 2 per cent. 



implied in those experiments by which the proportions of their constituent parts have 

 been determined. 



* I have already stated, § 10, that there are 2289.75 grs. of entire salt in a pint of 

 the brine from Walker's pit. In estimating that quantity, I made use of a cubic inch 

 measure, whereas in tlie other case (by inadvertence) ww omwcc measure was employed. 

 The difficulty of measuring the quantity very accurately in both cases is very great, and 

 in a saturated solution, an imperceptible variation in bulk would become very sensible 

 in weight. 



