504 TRANSACTIONS OF THE CANADIAN INSTITUTE. [Vou. VIII. 
much larger proportion of fluorine than the soluble part. Finally he 
showed 7° that the water of the Atlantic Ocean contains 0.822 grm. 
of fluorine or 1.687 grm. Ca F 2 per cubic metre. 
29. It is thus abundantly evident that under certain circumstances 
calcium phosphate has the power ‘of absorbing fluorine to form fluophos- 
phate. It remains to be shown that such a process is actually taking place 
in nature and that colour is lent to the theory that our deposits of caleium 
fluophosphates were produced from earlier deposits of phosphate by a 
subsequent process of fluorination. 
30. Again we turn to the illuminating researches of M. Carnot. A 
preliminary analysis of modern human bones gave him”? : 
i II 
3 LP aa ©) Okt Re UR SB hao tis ee es Se one 87.41 64.63 
WO egebl 22 Ol yc. SAORI Siena le Shean oeEne eat oy 1.97 
(COE Thy ATS Sat se ec Ae ie ep tae rla SPU A Be 0.35 0.88 
CR ee orc ECs Cy ca URE RUE EP te et ST Mea EP 0.23 0.44 
Ca US Se Pa aaa His ERTIES cau eT SP a 10.18 21.10 
RO) ibewreeye te ares Sos, ott ee Annie cl geet Se (0.43 Keon) beets 
SHICO pares cite elec So. witenel SS ye se Toe feck een eae: ote Magele net 0 75 
REN RAO) iris ayn etch icipa dince abeitaea ee reliance se) Meenas 9.63 
99.88 99-50 
in both of which the proportion of fluorine was small compared with 
that of apatite. 
31. This was followed by a series of analyses of fossil bones of various 
ages. The proportions of fluorine in these have been grouped in scale 
of increasing age as follows”? : 
Ratio between % Ratio between % 
Geological Terrain. of F in bone and of Ps O.% San 
Apatite. bone. 
average average 
IMO GERI ree nes riers aoe ee ie latte ia fella 0.058 0.058 193.10 193.10 
Quaternanys WC eis Ne le eiso aise cree 0.360 0.360 B30 31.30 
PGCE eee esi ee An Ole COMM ne ee yell 1OP20)) | ev areeiee 
Mertiary | FE NSS 0.610 0.620 nee 18.15 
| ISOCEMEM aecoke ari ba nO OOMD MW amie) sch us NO 2G) Maen Nace 
HOCeNe ala. sist atte Oni OOWNE ate vate TOL OOl ios (heen ctoteree 
(Cretaceousiae ey. ace eel ONOZOM MAN Anis a LP IBOLO VM PE ihe niOnaie ac 
Secondary | (urassic heir taky. Sete eee 0.910 0.907 12.30 12.40 
(ETIaSSIC se ey Ny ee tes OSSOOVM TM ea eelete L2 OOhrs 
Permo-carboniferous: |) 1-000) hey) 4-26 - TOM5O! ase weeks 
Primary | Devoniannee em acer: 0.980 0.993 II.40 II.30 
Siitinehleaganan do cae 1 OCZO!) i lebone eV R2EOO ca! muerte 
PA DALIE Heine leh cal habebt che oteyapa tae I .000 I .000 11.21 Tie 2 
23 An. de M. 9—10: 175. 
24 Carnot, Os modernes et os fossiles—An. des Mines 9; 3; 164. 1893. 
25 op. cit. p. 182. 
