44 



KANSAS UNIVERSITY SCIENCE BULLETIN. 



Rate less and force of heart unchanged; rate of respiratory activity 

 decreased for one minute, then normal, force increased. 



The upper respiratory and the lower cardiac records were secured with 

 levers directly attached to gill arch and apex of heart. 



Curve 16. After m/32 CaClo. 



Curve 16. 



The upper curve, Hiirthle manometer heart record. Lower curve, gill- 

 arch lever records of respiratory activity. Rate of heart decreased, force 

 unchanged. Respiratory activity and pressure unchanged. 



Curve 17. Effect of m/8 CaCl2. 



Currs 17. 



— > 



' —  — *■-■■  ,  ..  -.1.   _ _i 1 III  * 



The upper curve is a record of the cardiac and blood-pressure changes 

 secured with a Hiirthle manometer. The lower respiratory is a gill-arch 

 lever record. Rate decreased, force increased for both activities and 

 blood pressure showed slight rise for a minute or two. 



Curve 18. Effect of m/8 CaC^. 



Ourre 10. 



^"^^^^ f\{\AAAAM _ 



Upper, cardiac record secured with lever attached to the heart. Lower, 

 gill-arch record. Respiratory rate unchanged, force increased. Cardiac 

 rate decreased, force increased. 



Curve 19. Effect of m% CaC^. 



CUTTB 19. 



^'^^^rr^'^^^^fNAf;;^^ 



