Vlll 



CONTENTS. 



CHAP. VII. 

 On the Electric Condition of the Blood. 



71 



CHAP. VIII. 

 On the Electric Condition of the Muscular and Nervous Tissues. 

 Muscular Current. Nerve Current. Polarized Condition of 

 the Muscular Tissue and of the Nerve Tissue. . 74 



CHAP. IX. 

 On the Polarized Condition of the Muscular and of the Nervous 

 Tissue in the living or recently-killed Animal. Muscular 

 Force and Nerve Force, Polar Forces. ... 90 



CHAP. X. 

 On the Manifestation of Electric Force, of Chemical Force, and 

 of Heat, during Muscular Contraction. . . . 1 08 

 Sect. I. Manifestation of Electric Force during Muscular 



Contraction. 108 



Sect. II. Manifestation of Chemical Action during 



Muscular Contraction 127 



Sect. III. Manifestation of Heat during Muscular 

 Contraction. 130 



CHAP. XI. 

 On Nerve Force. Not Current Force, shewn by the Galvanometer, 

 the Galvanoscopic Frog, and the Magnetic Needle. A Polar 

 Eorce 333 



Sect. I. The Galvanometer 137 



Sect. II. The Galvanoscopic Frog. . . . ]40 

 Seci. III. The Magnetic Needle. . . . 143 



CHAP. xn. 



On the Manifestation of Current Electricity in Plants during 



189 



Vegetation. 



Sect. I. In the leaves of Plants. 

 Sect. II. In the Boots of Plants. 

 Sect. III. In the Petals. . 

 Sect. IV. In Fruits and Tubers. 



CHAP, xni, 



Conclusion. 



163 

 169 

 174 

 175 



178 



J J 



