BY DR. HARE. 
Ill 
formed, with the other a base. The binary compounds of 
his halogen class, comprising chlorine, bromine, iodine, 
fluorine and cyanogen, are called by him haloid salts. I 
shall use the names thus suggested. 
21. Among the haloid salts we have common salt and 
Derbyshire spar; the gaseous fluorides and chlorides of hy- 
drogen, silicon or boron; the fuming liquor of Libavius; 
the acrid butyraceous chlorides of zinc, bismuth and anti- 
mony ; the volatile chlorides of magnesium, iron, chromium, 
and mercury, and the fixed chlorides of calcium, barium, 
strontium, silver and lead ; the volatile poison prussic acid, 
and solid poisonous bicyanide of mercury, with various 
inert cyanides like those of Prussian blue: likewise a great 
number of etherial compounds. 
22. Among the amphide salts are the very soluble sul- 
phates of zinc, iron, copper, soda, magnesia, &c, and the 
insoluble stony sulphates of baryta and strontia; also ceruse 
and sugar of lead; alabaster, marble, soaps, ethers, and in- 
numerable stony silicates, and aluminates. Last, but not 
among the least discordant, are the hydrated acids and alka- 
line and earthy hydrates. 
23. When the various sets of bodies, above enumerated 
as comprised in the two classes under consideration, are 
contemplated, is it not evident that, not only between se- 
veral sets of haloid and amphide salts, but also between 
several sets in either class, there is an extreme discordancy 
in properties: so that making properties the test would in- 
volve not only that various sets in one class could not be 
coupled with certain sets in the other, but, also, that in 
neither class could any one set be selected as exemplifying 
the characteristics of a salt, without depriving a majority of 
those similarly constituted, of all pretensions to the saline 
character? 
24. Now, if among the bodies above enumerated, some 
pairs of amphide and haloid salts can be selected, which 
make a tolerable match with respect to their properties, as 
