168 



BULLETIN OF THE UNIVERSITY OF WISCONSIN. 



9a jp 5P ; 

 I80r 



A 3A 3P 9P >IA SA 3F 3P »A 9A 3P 9P 



IPM 



Fig. 16. — The ordinates show the number of letters named in one minute. The 

 abscissae show the progress of the hours as explained above. (Patrick.) 



Ch///7afefi» //ft in fa/&s. 

 Afac/ssete** /progress cf boors 



160 



-VPrt 



5AM 3P S>P 3A 3A 3P 6f 3A 2>A 3P S>P 3A 3a 3p 3P I Pfl 



Fig. 15. — The ordinates show the strength of lift in kilograms. The abscissae 

 ebow the progress of the hours as explained above. (Patrick.) 



