iR 3i ii^vjj^ orl// tq<{0/i 



!) IIt>jd f;iJil ('.ifiJ Jiici ,jli.<j 



Table V; 





tiJXt 3(1 ih'lAff 9Jft-l[> 



S' 



Name. 



lib 



•flS Formula. 



;(>S; ... <■ vi 



Atomic 

 Weight. 



r|[»ig 



Volume ill' 

 tion. 



»o1«- 







•= « o § 



Sulphate of \ 



magnesia / 

 Sulphate of 1 



zinc i;;... J 

 Sulphate of! 



iron J 



Sulphate of 1 



nickel ... j 



MgO,S03+5IIOT 



f 2H0 J 



ZnO, SO3+5HO 1 



+2H0 / 



FeO,S034-5HO 1 



+2110 fi 



NiO,S03+5HO 1 



+H0 I 



123-86 

 143-43 

 138-3 

 131-74 



63 ...L 



6* f<fii 



63 

 52-7 



63 

 54 



74-25 



5+2 



r.+2 



74-5 5+2 



74-61-660 



71-6 1-926 



i . 

 74-6 1 -854 



64-6 15+1 64-82-033 



1-660 

 1-931 

 1-857 

 2-037 



Before leaving this section we would sum up some of the 

 principal facts observed. In the first place, it is of much im- 

 portance to know that these salts dissolve in water without 

 increasing its bulic more than is due to the water attached to . 

 them as crystallized water. The acid and bases entirely dis- 

 appear in the water which is attached to them ; and so closely 

 does this rule prevail, that the atom of basic water in the tri- 

 basic arseniates and phosphates has ceased to play the part of 

 water, either in solution or in the solid state. In the condi- 

 tion of solid salts, we find four classes to which we have drawn 

 attention. The first of these is represented by salts having 

 their water firmly attached, and possess as a divisor for their 

 atomic volume a number equal or approaching to 11; and 

 we have concluded, as the quotient of this divisor is always 

 the same as the number of atoms of water attached to the salt, 

 that 1 1 is the volume of an atom of water in combination ; 

 and hence that the salts have disappeared in this attache^ 

 water, adding to its weight, but not to its observed bulk. ' ''Vrt- 



The second class of salts in this section is represented by 

 potash alum, in which the astonishing result is obtained, that 

 the 23 anhydrous atoms of this salt have combined in some way 

 with the 24« atoms of water, so as to cease to occupy bulk in 

 solution. The peculiarity of this group is, that an additional 

 1 1 becomes attached to the solid salt, so that the quotient of 

 the divisor is 25 instead of 24. This fact, and that connected 

 with the ammoniacal alums in the same group, cannot be dis- 

 cussed with propriety in the present place. 



The third group of salts in this section is one of high in- 

 terest, and is represented by salts having their hydrate water 

 attached by a feeble affinity. In them the volume of the 



Phil. Man. S. 3. Vol. 27. No. 182. Dec. 1 845. 2 I 



