Mineralogy and Geology. A33 
DIMETRIC SYSTEM. 
J 7. 
I. OF bit Os Be] 
Tin, 151° 24’) 132° 31’) 121° 26’ 
| geen "SE 6 FE | 0:1) 0:2 
Zircon, 148° 59’ 137° 50’ | 118° 54’ 
Rutile, 137° 40’ | 118° 46’ 
Cassiterite, 136° 26’ | 117° 43’ 
(Erstedite, 
| ie 
1 ee | | 0:21 O:4i | 
Scapolite, 138° 38’ | 119° 36’ 
Sarcolite, | 38° 25’ | 119° 24° 
Meionite, [138° 43’ | 119° 40/ 
Mellilite, nen 43’ | 118° 48’ 
IV. O:4 O44 Oss 
Apophyllite, 149° 30’ 138° 82’ | 119° 30’ 
Nagyagite, 137° 30’ | 118° 37’ 
Uranite, 137° 27’ | 118° 85’ 
natase 138° 23’ | 119° 297 
Matlockite, 138° 37’ | 119° 34’ 
Calomel, | 138° 56’ | 119° 51’ 
Hausmannite, 140° 17’ | 121° 3’ 
V. | O:rk O:2 
Romeine, 134° 17"| 124° 35’ 
Cerasine, 128° 06’ 
Chiolite, ge ay ae 
Braunite, 125° 40’ | 
Tdoerase, (2)123° 277 
\Copper Pyrites, 185° 25’) 125° 40’ 
?Tin Pyrites, 
Meliite, (1) 188° 27/| 128° 16’. | 
YL O:$ | O:li | | 
Scheelite, 133° 38/| 123° 59’ | 
Scheeletine, 132° 5’| 1229383’ | 
Wulfenite, | 122° 26’ | | 
Fergusonite, |. 794° 20 | 
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‘of Section Il nearly as 1:14; of Section II to that of Section IV, as 
1:2; and as it is somewhat hypothetical whether, in the last two, 4 or 
1 be correctly the fundamental plane, the relation may in fact be that 
‘of equality. For a like reason, since 2 may be correctly plane 1, Sec- 
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