PLATE. 



I. Illustrative of Dr. Draper's Paper on some Analogies between the 

 Phaenomena of the Chemical Rays, and those of Radiant Heat. 



Errata. 



Page 261, line 20, for an atomic element read a chemical equivalent. 



Page 265, line 10,/or = q V read = q v. 



Page 271, line 9, for twenty-four inch, read 20 four-inch. 



Page 273, line 2, dele Fig. 6. 



Page 320, line 2 from the bottom, for ante read vol. iii. 



Page 327, line 13, for 24" read 54". 



The notices of papers read before the Royal Society referred to in 

 vol. xviii. p. 547 note, will be found in the present volume, p. 240. 



