The CONTENTS. 
E X P E R I M E N T XI. p. 237. 
*^artarine Principles in the Strata thro' which 
Springs flow ^ n. i, &c. 
Hence the Mineral Waters which are called 
Acidulce are alkaline^ n. ii. 
Some Waters have no Tiartarine Principles in 
them^ n. 12. 
Phefe give Hardnefs to Water^ n. 14. 
Water in filtrating thro Gravel does not acquire 
Hardnejs^ n. 12, 15, 16. 
Several Waters evaporated to find their ^lan^ 
tity of Sediment y n. 17. 
Spring Water worjl whe?i the Springs are Jow^ 
n. 18. 
Phe ill Effe 5 ls of thefe hard Waters on oiir 
dies, n. 19, &c. 
P’he Ufe of thefe Experiments and ObfervationSj 
n. 28, 29. 
Why many Stones which fall from the Kidneys 
do not pa fs off, ibid. 
A Defcription of an Infirument to draw Stones 
out of the Urethra, n, 3O; &c. 
b 4 
The 
