222 FIELD CoLumMBIAN _MuseEuM—GEoLocy, VOL, I. 
table following gives the measurements by which these forms were 
identified, together with measurements of the other forms noted. 
The calculated values given with them are deduced from Scheieb’s 
ratios as quoted by Dana.* 
No. of 
Measurements. Limits. Observed. Calculated. 
Lo SOOT S540. batee «Rie eho ries meres 9. ay 
Pt Sa 2012 GAO n carer a: I 135 23n 1340) 
Br -S=EIOOl O40 races tyes ae I 19° 47' 19° 48' 
des =OLiO10i es eee I 45° 20’ ASS 31u 
OU VSeeOIOs O10 Reh aera I 84° 30' 84° 33’ 
Poh OO AT OAz she. eka c 79° 48'—80° 42' 80° 26’ 80° 9! 
pea 2 1T.O0.12 MOO em aere 3 52° 36’'—55° 34’ Seles 53° 934 
il, Sl LOO 20 Lame ee Senet 6 11° 47'°—=12-27' T20 125 ee 
Behe = PO kas OO Lge eee te 6 34° 36'—35° 9g’ 34° 36’ 34° 36%’ 
Oe aO108 O1LL Eee 4 48° 27'—50° 4o' 48° 34' 497.237 
ZECROLTPOOL seats 4 46° 25'—46° 30' 46° 30’ A722) 
Cb SOOLS aa LOn ss sik ee ee 4 82° 48"—84° 35’ 82° 50’ $3 1ke 
B10 100 SOIO Sac enee 4 80° —86° 33 82 oc0y 82° 35’ 
bea@=O10 % 100s he hanes 4 97° 25'—100° Oy aah O77 2hi 
The crystal faces were found in general 
to be fairly flat and bright, except the clino- 
| pinacoids, which were always vertically stri- 
| ated, so that no very satisfactory measure- 
' |%| ments could be made from them. The usual 
habit and development of the crystals is illus- 
trated in Fig. 1. Fig. 2 shows a completed 



| : crystal giving the new forms, & (11.0.12) and 

| : s (946) in their relative development. 
Fic. 1—Inesite. Fic. 2—Inesite. 
An analysis of the mineral was made by the writer. For this. 
purpose about two grams were laboriously separated from the calcite 
in which it was largely embedded. Experiments were first made 
upon the temperature at which water was driven off in order to deter- 
mine, if possible, the nature of its existence in the mineral. Abouta 
gram of the finely powdered mineral was heated at successively 
increasing temperatures until practically constant weight was 
*Dana’s Mineralogy, p. 565. 
