ANALYSES OF ROMAN GLASS FROM SILCHESTER. 169 
The results obtained were :— 
(A) Mixed sample. 
f 2, 3 4 Mean [Colorimetric 
FeO  [°86| "93 "93 “92 "93° methods 
MnO ‘70 [61] ‘72 ‘69 ‘70% 67% 
(B) Colourless glass 
meo 72 738° 70° 192% 
Mm ae | 5 "53 Bi "51% "48% 
(C) Dark bluish-green 
HEO- dc3d 1-26 1°30 . ... ~1-29% 
MnO 1°39 1°34 =—6.11°40 ee 1°38% 1°28%| 
From the foregoing analyses it is evident that the 
Silchester glass (A) does not differ materially in composition 
from a modern English crown glass, and more nearly still 
approximates that ofa Roman bottle analysed by Benrath; 
it is however very different from a modern bottle glass. 
For the sake of comparison some analyses of glasses of 
similar composition to this Silchester,' are appended :— 
Old Roman English 
A B C Egyptian bottle window 
H.O °41 
SiOz GEO Geo Soo esa) KOS eral 
Al,O 1°92 : Or 
Or saat 1119 ae ion 
Fe,Os; “I 74 Alea’) 39 1°24 
MnO 65 
CaO DAO SIPs sack) tee. O17 8°38 13°38 
MgO 1°09 
INarO SF lio3 oa hae: 208d TL 13225 
KO "D9 
Totals 99°94 100°08 99°70 99°26 
1 Analyses by Benrath, quoted by Roscoe and Schorlemmer, Metals, 
p. 473. 
