METHOD OF INCLINED PLANE 27 



at different positions of the screw. Rates of growth from, 

 say, 0-2 (X to I -2 (JL per second can thus be found directly 

 from the readings of the scale. 



The determination of the rate of growth now becomes 

 extremely simple. A few turns of the screw cause an exact 

 balance of growth, the index indicating the absolute rate. 

 The procedure is even simpler and more expeditious than 

 the determination of the weight of a substance by means 

 of a balance. 



B. Method of Compensation by an Inclined Plane 



With the apparatus already described, it is possible to 

 balance growth within the range of 0-17 [i to I'g [l per 



Fig, II. Diagram of Method of Inclined Plane. 



I, inclined plane pushed forward by revolving screw s, at rate 

 adjusted by rotation of vertical spindle v. The lower end 

 of rod R of the plant-holder rests on the inclined plane. {See 

 text.) 



second ; other instruments have to be employed when the 

 rate of growth is quicker or slower. In order to meet all 

 requirements in a single instrument, it became necessary 



