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Properties. Serum globulin is insoluble in water, but 

 soluble in dilute salt solutions (NaCl, (NH 4 ) 2 S0 4 , MgSOJ. 

 Its solution in dilute solutions of (KH 4 )J30 4 , or MgS0 4 , are 

 completely precipitated by saturating these solutions with the 

 respective salt, but it is incompletely precipitated by NaCl. 

 The coagulation temperature with 5-10$ NaCl in solution is 

 75 C. Specific rotatory power for a solution containing salt 

 is (a) D = - 47.8. 



Fibrinogen. 



Preparation. Precipitate salt plasma with an equal volume 

 of a saturated solution of NaCl (33$). The precipitate thus 

 obtained is pressed between filter-paper, redissolved in an 8$ 

 salt solution, the filtrate precipitated by a saturated salt solu- 

 tion as above, and after precipitating in this way three times, 

 the precipitate at last obtained is filtered, pressed between 

 filter-paper, and finely divided in water. These operations 

 should be performed rapidly, as prolonged contact with a half- 

 saturated salt solution renders the precipitate of fibrinogen 

 very insoluble. The fibrinogen dissolves by the aid of the 

 small amount of NaCl contained in itself, and the solution 

 may be made salt free by dialysis with very faintly alkaline 

 water. (Hammarsten.) 



Properties. Fibrinogen has the general properties of the 

 globulins, namely, insoluble in water, but soluble in dilute 

 neutral salt solutions. It is precipitated unchanged from 

 these solutions on sufficiently diluting with water. On heat- 

 ing it coagulates. When dissolved in a 5-10$ NaCl solution it 

 coagulates at 52 to 55 C , and the faintly alkaline or nearly 

 neutral weak solution coagulates at 56 C. Its specific rota- 

 tory power for sodium light is 52.5. 



Myosin, 



Preparation. 1. Finely chopped meat is extracted by 5$ 

 magnesium-sulphate solution. The filtered extract is then 



