224 J. P. Cooke on the Law of Definite Proportions 
Analyses of the Crystals formed in the Alloys of Zine and Antimony. 
STIBLOTRIZINCYLE, STIBIOBIZINCYLE, 
Composition Composition of Composition , Composition of 
of the Alloys the Crystals by Name of the Alloys the Crystals by Name 
by Synthesis, nalysig. of the | by Synthesis.| is. of the 
Perct.'Perct.|Per ct. Perct Su Analyst. | Perct.|Per ct. Per ct.\Per ct.! Sten Analyst, 
of Zn.|of Sb./of Zn.|of Sb. : of Zn.lof Sb, of Zn.|of Sb. : 
70°40|29'60/64:15)35°77| 99°92 Cooke. _ | 33-00)67 00,35°37|64'57| 99-94 | Cooke. 
66°50/33'50/61°00| 39-00 #100-00 |Cooke. do. | do. '85-40/64-60 +100-00) Cooke. 
94 |Cooke 32°50\67°50 84°62/64°92 
64°50 3560/53 50/41°44 | 99°54 | Storer 
+ +| + + 155-49/44-49) 99-01/Homer. | do. | do. [84:61|65-39|+100-00) Eliot. 
| 60°60/39'40/55°00/45:09| 100-09/Homer. | 31°50)68-50 33°95 
58°60 41°40/50°39/49-29] 99°68/Eliot. | 29°50/70°50 33°6 
v DU 00D 
to vy . 
54°70 45'30/48°26|51'42; 99°68/Storer. | 27°5 
52°70, 47°30/47'47|52:53/{100°00|/Cooke. | 26°50/73°50 32-08/67-60 99:68) Storer. 
. * Uv 
50°70 49°30/46°89/53'11/{100-00\Cooke. | 25°50'74:50 80 51; 99°94|Storer. 
do. | do. |46-45/53:'55|/¢100°00|/Cooke. | 25-00/75-00 29°'88/70-20| 100-08| Cooke. 
8'70 51°30/48°66 51-34) + 100-00} Eliot. 24-50'75 50 28°76|71-24) 100-00|Cooke. 
’ . 5 . 
rs 
a 
J 
(=) 
or 
wo 
9 
2 
ny 
. 6°77 53 ; BIT1° 8 . 
44°80 55°20/44-26 '55°73/+100-00 Eliot. 22°50'77°50 26°62|73'27| 99°89/|Storer. 
43°80 56°20 44-04/55°96 +100-00 Cooke. 21°50,78'50 24:°83|74-74| 99-57|Cooke. 
42°80 58°20/43'15 56°93, 100-08|Cooke. 20°12'79°88 20°58/79'42| 100:00|Cooke. | 
do. } do. |£3°0856'5 99°56|Cooke. | 
do. | do. {42°83 57-24 100:07| Cooke. 
ee ee 
Curve of Variation in Composition.—In order to compare to- 
gether the composition of the crystals and that of the alloy in 
which they form, I have resorted to the usual method of Analyt- 
ical Geometry, and in the plate illustrating this paper, the 
lower horizontal line is the axis of abcissas, and the vertical line 
at the extreme left the axis of ordinates. The first has been 
ing been all made in exactly the same* way. The po 
termined by analysis are indicated with dots, and the double line 
ts e 
It has already been stated that the crystals of Sb Zns are ob- 
tained in their greatest perfection from the alloy of 42°8 p. © 
of zinc. ‘They are then comparatively large, generally aggreg 
* In this analysis the antimony only was determined. 
t In this analysis the zinc only was determined. 
e 
