PLATE ]. 
Figure. 
1 Atomic 
percentage 
of tin. 
Per cent, 
by weight 
of tin. 
Magni¬ 
fication. 
Method of cooling 
the ingot. 
Method of 
etching. 
Description. 
i 
j 
1 
; 1 
Sn 1 
1-85 
X 18 
Unchilled 
Ignited 
Dark cores in the a. 
i 2 
i 
Sn 2 
3-7 
X 45 
C. 1025' 
HCl + YeCk 
Dark a. primaries. 
3 
! 
! 
» 
‘ 
3-7 
X 10 
S.c.c. 957° 
Grains of a possessing differ¬ 
ent orientation. Oblique 
illumination. 
3a 
1 
3-7 
X 10 
S.c.c. 957° 
Dark a. in white liquid. 
Vertical illumination. 
4 
3-7 
X 18 
s.c.c. 882° 
HCl 
Homogeneous a. 
5 
3-7 
X 18 
V.s.c.c. 770° 
NH 3 
5a 
Sn 4 
7-2 
X 18 
S.c.c. 800° 
HCl 
Cores in the a combs. 
6 
>5 
7-2 
X 18 
V.s.c.c. 900° 
HCl -f- Br 
a combs and liquid. 
7 
7-2 
X 45 
V.s.c.c. 800° 
HCl 
Homogeneous a. 
1 8 
55 
7-2 
X 18 
1 
V.S.C.C. 775° 
HCl + Br 
Cores in a. No matrix. 
9 
j 
J) 
7-2 
X 18 
V.s.c. not chilled 
HCl + FeCls 
Grains of uniform a. 
1 10 
Sn 6 
10-15 
X 45 
C. at 966° 
1 
Dark a in white liquid. 
11 
10-15 
j 
X 18 
S.c.c. 805° 
HCl and repolish 
Light a and liquid. 
