1901.] Properties of the Arterial and Venous Walls. 123 



Tracings made 14 days and 16 days p.m., showed an amount of 

 relaxation less than is seen in fig. 5, but greater than in fig. 6. 







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Fig. 5. — Transverse strip, carotid (horse), which has been kept in olive oil for 

 10 clays after death. 



Fig. 6. — Upper tracing from transverse strip of jugular vein. Lower tracing from 

 horse's carotid kept 18 days in olive oil. 



Strips cut^from a contracted artery parallel to the long axis of the 

 vessel behave, when heated, very differently from transversely cut 

 strips. Indeed, the former show alterations in length which are — up 

 to a certain temperature the converse of those shown by the transverse 

 strip, the contractions of the transverse strip between 20° and 35°, and 

 between 40° and 50° are accompanied by elongations of the longitudinal 

 strip — less [in amount it may be, but coinciding pretty accurately in 



