148 



HENRY D. HOOKER, JR. 



Experiment III. 



Ten roots of Ervum Lens, as before 



7" registered 34°C. and T'" 14°C. for the first nine hours. Later both registered 

 15°C. Number VIII was tightly rolled up, and could not be measured. All the 

 other roots remained straight. 



Experiment IV. 



Five roots of Lupinus albu.'^ 



T' registered 40°C.; T'" 13°C. All but number IV grew straight. Average 

 growth per hour 0.5 mm. 



