138 



figures of exp. 9 llial as long the organ is cooled, up to about 7,5°, 

 (he discharge diiniiiishes slightly, though not very considerably. 

 From 5—15° a rapid decrease follows wilh a slight recovery. Then 

 the organ apparently is dying. 



The changes in deviation of the test-potential were obtained by 

 changing the side-chain or the resistance, not by changing the sensi- 

 tiveness of the string (tension). 



Experiment 10. 



Large organ, kept in F. sol. containing 0^. 



The temperatures given are presumably not those of the inside of the organ 

 because the temperature changed too rapidly. Consequently the large organ conid 

 not have assumed the temperature of the environment. 



Heating to above 22° gives a considerable decrease as appears 

 from : 



Experiment 11. 



At 3.05 'o clock. Temp. 21°. 1 volt = 2,6 m.m. Deviation 25 mm. 



At 3.30 'o clock. Temp. 2.S°. 1 volt = 2,6 m m. Deviation 2,1 m.m. 



The rise in temperature has diminished the deviation to Vio- 



Experiment 14. 



At 5 'o clock. Temp. 20°. 1 volt = 5,5 m.m. Deviation 82 m.m. 



At 5.30 'o clock. Temp. 25°. 1 volt = 5 m.m. Deviation 17 m.m. 



The rise in temperature has caused the deviation to diminish to Va- 

 in Fig. 8 and 9 the string-record of the discharge at different temperatures 

 has been pictured together with the test-record. I have reconstructed it to the 

 best of my ability from the not absolutely focussed photographs. 



Large organ in F. opl. at 28° C. (since 12.55). 



Now 8 stimuli are given at intervals of 30 sec. 

 1.31 I 5 m.m. | 4.8 m.m. 



