380 Chemical Composition and Commercial Value of 
In thf! next table is given the composition of — • 
No. 1. Sound foreign bones. 
„ 2. I^ecayed foreign bones. 
,, 3. Decayed and sound foreign Ijones mixed. 
,, 4. London bones. 
No. 1. 
No. 2. 
No. 3. 
No. 4. 
PJiospliate of lime and magnesia (bone-1 
earth) J 
Carbonate of lime (dotermined by dif-'i 
ferenee) / 
12 ' 02 
28-71 
49-28 
4 -.'57 
4-55 
1-07 
1 2 - 1 .5 
27-27 
52-99 
4-35 
2-59 
-65 
12 ' 13 
27-80 
52-70 
4-17 
2-84 
•36 
1'^ • 31 
3n^73 
49-72 
4-25 
2-78 
•21 
100-00 
100-00 
100-00 
100-00 
3- 44 
4- 17 
3- 31 
4- 02 
3^43 
4-16 
3- 73 
4- 52 
In decayed bones the proportion of organic matter is not quite 
so great as in sound bones, and the phosphates are rather higher. 
But the differences are not sufficiently striking to require any 
comment. In the preceding analyses, the lime which is left in 
solution after the phosphates have been removed has likewise 
been determined quantitatively. Calculated as carbonate of 
lime, it amounts in the four analyses to 8'60, 8"71, 7 '50, 7'78, 
respectively. 
h. Boiled Bones. 
The bones from which glue-makers have extracted a certain 
portion of gelatine and nearly all the fat are known in commerce 
under the name of boiled bones. It must not bo supposed, how- 
ever, that Ijoiled bones do not contain any organic matter, nor 
furnish on decomposition any ammonia. The following two 
analyses show the contrary : — ■ 
Cnmposition. of Two Sainples of Boiled Bones. 
Moisture 8-06 7-70 
♦Organic matters 25'45 25-27 
Pliosphates of lime and magnesia (lioiie-c.irtli) 60-48 4.j-7;5 
Carbonate of lime 3-25| g.^^ 
Alkaline salts '43/ 
Sand 2-33 13-53 
100-00 100-00 
* Containing nitrogen 
F<((iial to ammonia . , 
1- 84 
2- 24 
2- 78 
3- 37 
