ov Misi u:> AND M:I;\I:S. 



key so as to allow the induct ive currents to have access 

 to the muscle. The latter at once shortens, and its 

 height of elevation is indicated by a vertical stroke on 

 the smoked glass plate. On instituting a series of 

 experiments with the same muscle but with various 

 weights, it will be found that the muscle is not able 

 to raise all weights to the same height. When the 

 \\ e>ht is small the height to which it is raised is gnat . 

 As a rule, as tin- weight increases, the height to which 

 it is raised becomes less, and finally, when a certain 

 weight is reached, it ben unes unuoticeablc. Fig. 15 







50 



100 



150 



200 



250 



FlG. 15. IIl-llClIT OF KI.F.VATION C< iNSK.QU KNT ON Till-: ATPI ICATIoN OP 



YAKY1NU WEIGHTS. 



slmws the result of a series of experiments of this sort. 

 The figures under each of the vertical strokes represent 

 in grammes the anmunt of the weight raised ; the height 

 of the strokes is double the real height of elevat inn, 

 t In- ajijiarat us employed in t he experiment representing 

 them twice their natural si/.e. Jlet \\eeii each two of 



the experiments th" ^lass plate was pushed on a little 



further in order that the separate experiments might 

 be indieated side by side. Jn tinding the first of 

 t hese height - of el e\ a t i-ni, under which stands an 0, no 

 weight. A\as applied, and e\en the \\eight of the indi- 

 caling le\er \\as neiit ralised l>y an cimix'aleiit weight. 

 It appear-, therefore, that the height ,,f elevation is 



