FIBRIN FROM BLOOD. 197 



weight of fibrin, or rather protein. Now the numbers which 

 agree best with the mean of the analyses, and with the atomic 

 weight deduced from the experiments of Mulder, are the follow- 

 ing: 



45 atoms carbon, . 33-75 or per cent. 52-03 



38 atoms hydrogen, = 4*75 ... 7-32 



6 J atoms azote, . =11-375 ... 17-53 



15 atoms oxygen, . =15-00 ... 23-12 



64-875 100-00 



More lately Mulder has endeavoured to determine the quan- 

 tity of sulphur and phosphorus which occurs in fibrin. These 

 two substances he considers as combined and forming a sulphu- 

 ret of phosphorus. By an ultimate analysis of fibrin he got, 



Carbon, . 54*56 



Hydrogen, . 6-90 



Azote, . 17-72 



Oxygen, . 22-13 



Phosphorus, 0-33 



Sulphur, . 0-36 



102-00* 



He represents the constitution by 10 (C 40 H 31 Az 5 O 12 ) PhS. 

 Calculating from this, we get, 



400 carbon, . =r 300- or per cent. 54-52 



310 hydrogen, = 38-75 ... 7-04 



50 azote, . = 87-5 ... 16-90 



120 oxygen, . =120-0 ... 21*35 



1 phosphorus, = 2- ... 0-36 



1 sulphur, = 2- ... 0-36 



550-25 



Fibrin from venous human blood was purified by Dr Scherer,f 

 and subjected to various ultimate analyses; being burnt sometimes 

 with oxide of copper, but in four out of six analyses by chromate 

 of lead. The following is the mean result of these six analyses : 



Ann. der Phar m. xxviii. 74. f Ibid. xl. 33. 



