J. L. Smith on the Emery mine of Chester, Mass. 89 
coming from Naxos and other well known localities is not that 
compound, and that if one is emery the other is not. But asI do 
not take their view of the 2 hy in consider the Chester mineral 
as true an emery as that of ‘Naxo 
Effective Composition. . 
. jhardness | Specific i 
= Locality. Sapphire ghewiky, Water.| Alumina. purge Lime. | Silica. 
100. iron. ig 
Emery 
1 | Kulah, ” 57 428 1:90 | * 63:50 32°25 0°92 | 161 
2 Bamogees avcdewes 56 3°98 | 2°10 7010 22°21 0°62 | 4:00 
3 DASARI 5 ees cea icie'ea 56 3175 | 2°53 71:06 0°32 1:40 | 4-12 
(ICON fot oe wee 53 402 | 2°36 63:00 30°12 0°50 | 2°36 
5S | Nasa: ooo és 46 3°75 “13 58:53 24:10 0°86 10 
6: | Wicetiaeccedine vs 46 3-74 | 310) 75-12 12:06 | 0°72 | 6-88 
td UO snd eaters 3°87 | 5°47 69°46 19°08 2°81 | 2-41 
§ | Hphesus, ...6..... 42 431 5°62 60°10 33°20 0-48 | 1:80 
9 eter ee est 3°89 | 2°00 61:05 27°15 1:30 | 9°68 
CorunpuM. 
1 — of India, 100: 22062 pera] Pel 189 oie OBO 
2 90 eta ees 97:32 LOO. bea 3 
3 Cores, phing aT 388 1:60 92°39 1°67 112 } 2°05 
4 Asia M., 65 3°92 | 0°68 87°52 7-50 082 | 2-01 
5 se Asia, 60 3°60 | 1°66 86°62 $21 O70 | 3°85 
6 _ India, 58 3°89 | 2-86 93°12 O91 1:02 | 0-96 
7 by Asia, 57 3°80 | 3°74 87°32 3°12 1:00 | 2°61 
8 India, 55 3-91 3°10 84°56 706 1-20 4:00 
Emery. 
1 | Chester, Mass.,....) 33 ESS ee 44°01 BOS 7 ee | SS 
2 «. §: (qasale Se ae ee BA aes 8-26 
3 a vt pee’ pees ene e 5192 42°25 « | 546 
4 id i ie 45 “ wee 74-29 19°31 . | 548 
5 rs e ae a Sti sees 84-02 9°63 eee | OE 
different suites of chectve: Savinese. Thus: Nos. 9 and 4 . 
ula emeries, containing about the same amount of alum 
_have effective hardness in the proportion of 40 to 53. but it twill 
be seen that No. 9 contains 9°6 per cent of silica, which doubt- 
Am. Jour. Sci.—SeconpD Serres, Vou. XLII, No. 124.—Juxr, 1866. 
12 
