323 
Angles of Inclination. 
The whole matter of the inclination at which roots and stems show 
their strongest geotropic response is brought to this condition, as shown 
principally by the method of alternate stimulation : — 
The orthotropic stems of plants receive their maximum gravitation 
stimulation at an angle of 90° from their position of stable equilibrium. 
This is shown by every one of the five species of seedlings used in the 
present paper, and by some ten species of plants with older stems, as will 
soon be shown by the publication of other work from this laboratory. 
The orthotropic roots of plants receive their maximum gravitation 
stimulation at an angle of 90° from their position of stable equilibrium, as 
shown by every one of the six species of seedlings alternately stimulated, 
as recorded in this paper. 
The lateral roots of plants Czapek found by the method of alternate 
stimulation to receive their maximum gravitation stimulation at 6o° to 90° 
above their position of stable equilibrium. 
Orthotropic roots and stems of plants, as shown in the present paper, 
receive equal gravitation stimulation at equal angles above and below the 
horizontal. 
Lateral roots, as found by Czapek, curve more readily when displaced 
above their position of stable equilibrium than at equal distances below. 
