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A, Portion of a Medium-sized Human Muscular Fibre (magnified nearly 800 diametersX 



B, Separated Bundles of Fibrils, equally magnified : a, a, larger, and b, b, smaller collec- 



tions; c, still smaller; d, d, the smallest which could be detached. 



globulins, which may be derived from muscle. This substance 

 bears the same relation to living muscle that plasma does to living 

 blood. By pressing muscle kept at a temperature below the freez- 

 ing-point it is possible to obtain a viscid, opalescent fluid of alkaline 

 reaction, which soon presents the phenomenon of clotting, and one 

 has resulting a muscle-serum and muscle-dot. This muscle-clot is 

 myosin. During the process the fluid becomes acid in reaction. 

 The clotting of muscle-plasma is caused (probably) by ferment 

 action, and the ferment (myosin-ferment) is derived from a com- 

 posite antecedent, similar to fibrinogen, called myosinogen. 



What gives muscle its red color ? 



Haemoglobin of the blood in some degree ; but there is also a 

 distinct pigment known as myohsematurin. 



