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Prof. J. C. Bose. On the Continuity of [Apr. 18 7 



true through a limited range. From the results of various experi- 

 ments, into the detail of which I can not at present enter, it appears 

 that, generally speaking, the curve of response (with molecular effects 

 as ordinates, and the intensities of disturbance as abscissae) is not a 

 straight line. It is at first slightly convex, then straight, and in 

 the last part concave. It is only in the second part that the curve is 

 approximately straight. 



In considering the effect of electric radiation in varying the con- 

 ductivity of the particles, we have to bear in mind that no explanation 

 can be regarded as complete, unless it explains not only the diminution, 

 but also the increase of resistance ; also the phenomenon of auto- 

 matic recovery and of the opposite effects which are exhibited by the 

 same receiver under different molecular conditions. The increase of 

 resistance of the Ag' receiver and its instantaneous recovery are directly 

 opposed to the theory of coherence. 



The state of balance between the distortion produced' by radiation 

 and the force of restitution on the one hand, and the different equili- 

 brium positions with different radiation intensities on the other, point 

 to the effect being due to some strain produced by radiation. 



Fatigue of the Receiver. — I wished to trace the gradual appearance of 

 fatigue in the Ag' receiver, and for this purpose kept it acted on with 

 slight intermissions for nearly 3 hours. At the end of that time it 

 began to show unmistakable signs of fatigue. Fig. 6 shows the 



Fia. 6. — Fatigue and reversal in the Ag' receiver. Thick lines represent the effect 

 of radiation, and dotted lines the recovery. Observe in the first three records 

 the incomplete recovery with growth of fatigue. In the fourth, there is 

 produced a reversal (a diminution of resistance instead of the normal increase). 



effect when the radiator was at a distance of 20 cm. ; the deflections, 

 were now only twenty-one divisions, whereas before this the deflection 

 was thirty-three divisions with the radiator at the increased distance of 

 25 cm. Formerly the recovery commenced immediately on the eessa- 



