53 
1914-15.] Studies on Periodicity in Plant Growth. 
(c) The same peculiarities are seen in the organs in continuous darkness 
or lisrht as in the winter months. 
o 
General Results. 
1. The root and shoot rhythms are correlated, and vary together with 
changing conditions. 
2. No evidence is obtained of any sign of the disappearance of the 
periodicity under uniform conditions whether of light or darkness — an 
argument in favour of the autonomic nature of the phenomenon. 
{Issued separately February 24, 1915.) 
