Another method of applying the stimulation is shown in Figure 3. 

 This consists of two seven-inch glass funnels. Within each of these 

 funnels are two copper discs, a small one at the bottom and a larger 

 one at the top. In the upper disc of each funnel are twelve holes, 

 at equal intervals around the edge, to allow the hypocotyls to grow 

 through, between the discs of each funnel is placed a layer of moist 

 sand in which the seeds are planted. To the discs of one funnel are 

 attached wires, by means of which they are connected with the poles 

 of the induction coil. In this way a current may be passed through 

 the moistened sand which acts as a good conductor. 



The object of taking a funnel, rather than a cylinder, is that the 

 action of gravity constantly draws the roots against the glass, allow- 

 ing measurements to be taken from the outside, whereas were the 

 sides vertical, nutation and such forces as hydrotropism might cause 

 the root to grow inward and away from the glass. 



In experiments with this apparatus the seeds were first germinated 

 in sawdust and when the radicles had reached a length of about two 

 centimeters tliey were removed to the funnels where the subsequent 

 growths of the normal and stimulated plants were compared. 



In Figure 4 is shown an appaiatus very similar to that in Figure 3 

 with the exce|)tion that in this case four-inch clay pots were substi- 

 tuted for the funnels. 



This apparatus is not adapted for observation of root growth, but 

 simply that of the hypocotyls. In the upper discs are seven holes 

 through which the young seedlings grow, as shown in the diagram 

 in Figure 4, which repretents a cross section of the pot where the 

 plants were treated with electiicity. 



GERMINATING APPARATUS. 



In the selection of germinating pans for this work two chief 

 points have been taken into consideration. Fiist, that the normal 

 or untreated seeds shoidd have exactly the same environments as 

 those treated, aside from the conditions brought about by the appli- 

 cation of electricity. Second, that the conditions for germina- 

 tion should be as favorable as possible, that is, that there should be 

 the proper amount of heat, air and moisture to give the best possible 

 conditions. 



The form of apparatus which was used in these experiments and 

 which seems to fuHil the requin'meiits very well is shown in Figure 5. 

 This consists of two plates, an outer of porcelain about nine inches 



