57 ° 
Notes . 
thirty-seven haulms, thirty-three curved from the horizontal with an average curve 
of 14° and only four curved in the opposite direction with an average curve of 4 0 . 
There were five experiments, each carried on for about twenty-three hours. 
My experiments thus fully confirm Fitting’s conclusion that the horizontal 
is the position of maximum stimulation. 
Botany School, Cambridge, 
July , 1905. 
D. F. M. PERTZ. 
