22 A Bir,LIOGKAPHY OF THE CHEMICAL INFLUENCE OF LIGHT. 



WoLLASTON, "William Hyde. On certain chemical effects of light. Nich- 

 olson's Jour. 8 (1804) 298 ; Gilbert's Ann. 39 (1811) 291. 



Woods, Thomas. On the measurement of the chemical brightness of 

 various portions of the Sun's disk. Phil, Mag. [4] 28 (1864) 166 ; 

 Jsb. (1864) 116, Abs. ; see Roscoe, same page. 



Young, Thomas. Experiments on the dark rays of Ritter. Phil. 

 Trans. (1804) 15; Gilbert's Ann. 89 (1811) 282. 



ff 



