it 
in the Compounds of Zinc and Antimony. 229 
Before discussing the conclusions to which the facts already 
stated seem directly to point, it will be well to see how far the 
variation in composition corresponds to a variation in the proper- 
ties of the two compounds. ‘Three classes of properties have 
been examined in this connection, viz., Specific Gravity, Crystal- 
line Form, and Affinity for Oxygen, which will be treated of in 
ee er. 
Specific Gravity.—The specific gravities of all the weiner: 
Selec: as well as that of the zinc and antimony used in the 
investigation, were taken with the greatest care. The deter- 
minations were made with a nicely constructed specific gravity 
bottle, as this method was found susceptible of greater accuracy 
than any other, when the temperature was observed with precis- 
ion. In calculating the specific gravity, the weight of the water 
was corrected for the temperature, so that the unit is in all cases 
distilled water at 49°C. A similar correction could not be made 
for the temperature of the substance, as the coefficients of expan- 
sion of the dts are not known. ‘The results of the deter- 
ion all made by myself are collected in the following table 
n the column headed “ Sp. Gr. by Experiment.” In the column 
Specific Gravities of Crystals, formed in the Alloys of Zine and Antimony. 
Composition of the Alloys, |Composition of the map coer sles ‘Exper 1 Zi a = ~~ = Cassa 
Per ct, Tet. of Zn, Per rct. of Sb.) \Pe ret. of Zn.| Per ct of Sb. Ant timony, liz 
G ee 715 
4-00 7-069 4184 0:065 
13°80 6898 7-086 0188 
23°40 6-769 7-039 0-270 
29°60 64:20 35°80 6-699 6982 0-283 
33:50 61:00 39-00 6°628 6°967 0339 
35°50 58°56 4144 6596 6956 0:360 
STD 55°53 44-47 6506 6-941 0-435 
39°40. | ® 55.00 45:00 6440 6939 0-499 
414 039 49°61 6396 6-917 0-521 
43°40 49°95. 50:05 6388 6915 0" 
51°30 .| 48°66 51°34 6404 6909 0505 
53°30 |, 4677 53°23 6376 6900 0-524 
55204}  44°268 55°14 4 6341 6888 0'5: 
57°20 3-09 56°91 6327 6882 
60-00 6-386 6867 O481 
65-00 6404 6844 0 
67-00 35°37 64:63 6-401 6°82 0° 
70°50 83-62 66° 6-384 | . 6837 
72°50 3°85 66°15 6383 6838 | 0455 
73:50 32-08 67-92 6400 | 6829 
74-00 31-07 68°93 6418 | 6824 06 
44°50 69°57 6428 6°82: 0394 
1550 28-76 q1-24 6-449 6813 | 0364 
17-50 26°62 13°38 6453 6803 0°350 
78°50 24-83 4517 | 6-467 6-795 0328 
90-00 6-603 6°725 0°122 
95-00 - oo 6655 6-701 0046 
100:00° g 66717 6677 0°000 
* Alloys not crystallized. 
