506 TRANSACTIONS OF THE CANADIAN INSTITUTE. [Vor. VIII. 
have been substantiated by numerous analyses, tend to prove that in the 
compound represented by the formula: 
Cals 2 3/020: 
the F may be molecularly replaced by Cl. 
33. But even with the-light which these facts throw upon the com- 
position of apatite, considerable discrepancies were observed by M. Carnot 
when he turned to an examination of the chemical composition of the 
Canadian Apatites. Thus two specimens from Renfrew and Templeton 
respectively, gave the following analyses: 
I II 
2 OES ae enti tarot eieieetees 41.00 41.50 
TDs ae dA ees Lane La Ge ie Ge 2.26 1.26 
CIE ROM a toc. eoviake Merten ee 0.28 0.37 
CHO a en ahi cake ener 1.50 2E 20 
(CAO SEH a oe tera Cree ior 50.84 52.90 
Mir) rane: Ghz shi. eens tr tr eta 
SIC) ie sat Le aOR RS SDB | 1.30 bt 
Me POAONs ema chose nated 4.59 0.22 
SIO ere ait, coh OREO ooeiciohe 0.55 0.30 
IOI .00 100.15 
I II 
Hf PRESEHt ec elie cio peteNrislinks Geis 2.24 TH20 
F corresponding to Cl........ 0.15 0.20 
Mo tales wore aaihee bcisicke sateen 2539 1.46 
Calculated Retain wee nee 3.66 3.76 
In order to account for the abnormally small proportion of fluorine both 
actual and replaced by chlorine, the amount of fluorine which would 
correspond with the carbon dioxide present was calculated as follows: 
I II 
1.30 1.99 = 
which, when added to the previous total, give us 
I II 
3.69 3-45 
‘These results, as will readily be seen, approximate with reasonable accu- 
racy to the calculated amounts. 
34. The final step in fixing this fact was to produce artificially this 
replacement by CO 2. To do this he placed a finely powdered portion of 
a carefully analysed apatite in a hermetically sealed tube with a solution 
