CHAP. VII.] THE CONNECTIVE TISSUES. 27-") 



The following analyses l illustrate the composition of the mineral 

 matters of bone. 



1. RESULTS OF THE ANALYSES BY HEINTZ 3 . 



Ox. Sheep. Man. 



(1) (2) 



Ca 38-52 38-52 38'59 38'56 



PO 4 52-98 53-29 5375 53'87 



C0 3 6-04 5-65 5-44 5'51 



Fl 1-89 1-96 174 1*58 



Mg 0-57 0-58 0-48 0'48 



II. ANALYSES OF THE BONES OF CHILDREN. (RECKLINGHAtJSEN.) 



Bones of skull Bones of child Bones of child of 6 years, 



of child 3 14 days old. Femur, 



days old. Skull. Femur. Cortical layers 



(diaphysis). Epiphyses. 



Ca 38-41 36-43 37'66 37'98 37*97 



P0 4 56-20 56-96 54'81 54'86 5673 



C0 8 4-85 6-02 7-06 6'88 4-97 



Mg 0-54 0-5.9 0-47 0'28 0'33 



HI. ANALYSES OF THE BONES OF MAN AND THE OX. (ZALESKY. 3 ) 



Man. Ox, 



Ca 4013 40-69 



P0 4 52-16 53-50 



C0 3 7-81 8-45 



Cl 018 0-20 



Fl 0-23 0-30 



Mg 0-29 0-28 



From all the analyses which have been made we may legitimately 

 conclude that the proportion of mineral to organic matters in bone, 

 and even the relative proportion of the different elements, vary 

 remarkably little in animals of different species, and of different 

 ages. 



The chief salts present in bone are five in number, of which four 

 are compounds of calcium, and one a compound of magnesium. 

 They are calcium phosphate, Ca 3 2(P0 4 ); calcium carbonate, CaC0 3 ; 

 calcium chloride, CaCl 2 ; calcium fluoride, CaFl 2 ; magnesium phos- 

 phate, Mg 3 2(P0 4 ). In addition to these, very small quantities of 

 sulphates and chlorides are always present. 



1 Extracted verbatim from Hoppe Seyler, Physiologische Chemie, p. 105. 



2 Heintz, "Ueber die chemische Zusammensetzung der Knochen." Poggendorff's 

 Annalen, Vol. LXXVII. (1849) p. 267. 



3 Zalesky, " Zusammensetzung der Knochen von Menschen und Thieren." Med. 

 chem. Untersuchungen von Hoppe-Seyler. Part 1, p. 19 et seq. 



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