312 IX. WATERY LIQUIDS.— 



pitate the solution of silver, lead, or quicksilver in spirit of nitre, 

 forming a yellow cloud ; not affected by acids, but afford a pre- 

 cipitate with subcarb. of potash ; contain Epsom salt ; the springs 

 of Bagnigge Wells, Dulwich, and Epsom, are of this nature. 



Alkaline waters, Aq. alkalincE. Change blue vegetable 

 colours to a green, effervesce with acids, yield a precipitate with 

 alum water. Tilbury water is an example. 



Copper waters, Aq. cuprece. Turn blue with liquid subcarb. 

 of ammonia, if not already of that colour ; cover iron left in them 

 with a coat of copper ; contain blue vitriol ; found near copper 

 mines, poisonous. 



Aluminous waters, Aq, aluminosce. Change vegetable blue 

 to a red, even after standing some time in the open air, effervesce 

 with alkalies, and are decomposed, precipitating in flocculi. 



Petrifying waters, A. lapidificantes. Deposit an earthy 

 sediment on standing or by boiling; unwholesome. 



Stygian vfAT^-R, Aqua Stygis. Corrodes glass and earthen- 

 ware, contains fluoric acid : poisonous, reported to have been 

 exhibited to Alexander the Great, and to have occasioned his 

 death, the water being carried from the spring in Arcadia, in a 

 horse's hoof: another spring of this kind has been lately found in 

 Prussia, and closed up by the government. 



Sea water, Aqua marina. Contains common salt and Epsom 

 salt in large quantity; purgative, but should always be filtered 

 through paper to separate the fine sand and invisible mollusca 

 that it contains: the taste is best covered by mucilage of salep. 

 It is the usual clyster on board ship. Many attempts have been 

 made to obtain fresh water from it at sea. 



May DEW, Ros majalis. Collected by sponges off the grass: 

 used as a cosmetic. 



Senna sula vinegar, Cadalay poolippoo neer. The night 

 dew wrung out of muslin spread over horse gram while growing: 

 used in India as the common vehicle for medicines; contains 

 oxalic, malic, and acetic acids. 



ARTIFICIAL WATERS. 



Distilled water. Holy xcater, Aqua distillata^ Aq. depurata. 

 Rain or river water 10 gall, distil, throw away the first half gallon, 

 and draw off 6 gall., which keep in glass or stone ware vessels, 

 covered only with paper caps to admit the absorption of air. 

 Used as a diet-drink in cancerous diseases, and in the religious 

 ceremonies of the Catholic church. 9 parts of water are resolvable 

 into 8 of oxygen and 1 of hydrogen by weight. 



