258 DETAILED SYNTHESIS. 



straightening his trunk and head upon his lower extremities is equal to 

 many thousand pounds. 



562. EVERY EXERTION" OP MUSCULAR POWER is AT- 

 TENDED WITH a corresponding amount of waste in the 

 material of the muscle, as is proved by the fact that the 

 dark red color of the Blood increases with continued 

 muscular exertion, as seen in the case of animals hunted 

 to death, and by the fact that exertion too long contin- 

 ued decomposes the muscle so much that it will never 

 recover. 



663. Illus. THE AUTHOR is ACQUAINTED WITH A CASE where, by 

 over-exertion at a fire, a person's muscles became incapable of recovery, 

 and for years he was unable to move. 



564. THE DECOMPOSITION OP THE MUSCULAR SUB- 

 STANCE renders it necessary to have large respiration 

 and great muscular exertion go hand in hand, since 

 oxygen must be furnished to assist in removing the de- 

 composed substance from the muscle, while carbonic 

 acid must also be removed from the blood. 



565. Inf. THIS ACCOUNTS for a full development of the chest and 

 muscles always existing together ; the former is a sine qua non of the 

 latter. 



666. Inf. THIS ALSO ACCOUNTS FOR the fact that a higher activity 

 of the muscles is attainable in cool than in hot weather. 



667. Inf. It FOLLOWS ALSO that the circulation should be more 

 active through active muscles than through those that are inactive. 



568. EVERY MUSCLE is a heart, especially in respect 

 to itself, since it assists in the circulation of so much 

 Blood, at least, as flows through itself. 



569. EVERY MUSCLE, WHEN IT CONTRACTS, presses out 

 the Blood it contains, chiefly onward into the veins, and 

 when the muscle relaxes (since from the valves in the 

 veins the Blood cannot flow back, and since there is a 

 pressure in the arteries crowding the Blood forward), it 

 gushes through every part of the muscle, supplying it 



662. - what ? 563. of what? 564. What said of? 565. for what? 

 566. what ? 567. What ? 568. what ? 569. What said of ? 



