412 ANIMAL BODY: 



dog. In the second analysis the composition of the healthy 

 radius and ulna are represented. 



1. 2. 

 Exostosis. Radius and ulna. 

 Phosphate of lime with fluoride i 



of calcium .} '" 60 ' 95 



Carbonate of lime . . 1-00 2-84 



Phosphate of magnesia . 1-55 1-39 



Salts . . . 0-91 0-93 



Cartilage . . . 45-74 32-88 



Fat . 2-81 1-01 



We observe in both these cases that the exostosis contains a 

 larger amount of organic matter than healthy bone.] 



I have analysed a remarkable osteoid tumour that formed 

 on the knee of a leucophlegmatic boy aged 14 years, who was 

 suffering from oadema. The tumour was ten inches long and 

 twenty-five broad, and could be hardly half spanned with both 

 hands. The limb was amputated and the tumour examined. 

 I analysed separately three portions of the tumour, one hard 

 and bony, a second softer, and a third perfectly soft. On ex- 

 posing them to heat on an oil-bath, the first became white and 

 earthy, while the other portions assumed a horny appearance. 



Ether took up a dirty yellow, non-phosphorized fat. 



The three specimens yielded on analysis : 



Anal. 155. Anal. 156. Anal. 157. 



Phosphate of lime . . 35-85 8-00 9-20 



Carbonate of lime . . 270 0-62 0-64 



Phosphate of magnesia . . 0-58 0-21 



Soluble salts . . . 0-521 



Chloride of sodium . . 0-26 J 



Fat . . . 1-16 3-61 3-21 



Cartilage and vessels . . 58-91 87-04 86-20 



The proportions of the fixed salts to each other in these cases, 

 and as they occur in normal bone, are exhibited in the following 

 table : 



1. 2. 3. Healthy bone. 



Phosphate of lime . 89'7 86-5 86-9 79-4 



Phosphate of magnesia . . 1-5 1-9 1-7 



Carbonate of lime . . 6-8 6-6 6-0 16-9 

 Soluble salts . . . 0-7 T r 1-4 

 Chloride of sodium . . 1-3/ LO-4 



The most striking peculiarity is the relative diminution of 

 the carbonate of lime. 



