142 
ANALYSIS OF A COMPACT OSSEOUS TUMOUR. 
would tend to complete our knowledge respecting its true 
nature and character. Having made such an investigation, 
I have now the pleasure of directing attention to the fol¬ 
lowing statement of the results obtained. That a comparison 
may be instituted between the composition of this tumour 
and that of normal bone, I have placed the analyses of these 
two substances side by side. 
Compact Osseous 
Femur of Mare 
Tumour. 
aged 14 years. 
Yon Bibra. 
Phosphate of lime, with traces of fluoride of 
calcium .... 
. 6273 
54-63 
Phosphate of magnesia 
. Traces. 
1-50 
Carbonate of lime . 
5-84 
11-28 
Carbonate of magnesia 
. Traces. 
Salts soluble in water 
. Traces. 
0-40 
Organic matter (gelatin, fat, &c.) . 
. 31-43 
32T9 
100-00 
100-00 
We thus see that the osseous tumour contains about 8 
per cent, more of phosphate of lime, probably from 1 to 
IT per cent, less of carbonate of magnesia, and about 5-1 per 
cent, less of carbonate of lime, than the bone of the mare ; but 
that in other respects there is a striking concordance in the 
qualitative and quantitative constitution of both specimens. 
It may be well to remark that Yon Bibra has published 
the analysis of the femur and humerus of a castrated horse, 
aged six years, and that the composition of these bones was 
not found to differ essentially from that of the fourteen-year- 
old mare. If we now compare the composition of the 
osseous tumour with the bone of the mare, with reference 
only to the relative quantities of earthy and animal matters 
contained in them, we shall find that the difference is so 
extremely small (f per cent.), that it may be completely 
rejected from our consideration. 
Earthy matters. Animal matters. 
Osseous deposit . . G8*57 1 Difference 31'43 1 Difference 
Mare’s bone . . 67‘81J 076 32T9 J 0 76 
Thus we are enabled to conclude, from the mutually cor¬ 
roborative testimony afforded by the physical, anatomical, 
and chemical examination of the osseous deposit, that it pos¬ 
sesses all the characters of true bone. 
