vi CONTENTS. 



LECTUKE V. 



BY PROFESSOR G. FORBES. 



PAGE 



RADIATION 173 



LECTUKE VI, 



BY H. C. SORBY, F.R.S. 



MICROSCOPES 193 



XECTURE VII. 



BY J. T. BOTTOMLEY, M.A., F.R.S. B., DEMONSTRATOR OF NATURAL 

 PHILOSOPHY IN THE UNIVERSITY OF GLASGOW. 



ELECTROMETERS 216 



LECTURE VIII. 



BY SYDNEY H. VINES, B.A., B.SC., FELLOW OF CHRIST'S COLLEGE, 

 CAMBRIDGE. 



ON THE APPARATUS RELATING TO VEGETABLE PHYSIOLOGY 249 



LECTURE IX. 



BY PROFESSOR CAREY FOSTER. 



ELECTRICAL MEASUREMENTS 264 



