55 
attached to the tip of a leaf by means of a small cord and a 
times as great, of the pen. During the time in which rapid 
Precision auxanometer for measuring and recording growth of pla 
Fic. 3. 
attached to a leaf of Myacinthus Belgicus. (From MacDougal’s Practical ae 
Physiology. By permission of Longmans, Green & Co.) 
growth is taking Place the pen moves slowly upward on n the ta 
aki 1 
various parts of the day and under various conditions may be 
ma 
D. T. MacDoucat. 
