Tkans. Acu). Sci. oi- Si. I.oi is, X'oi . \\l\' 



Pi. ATI- X 



App.Mrnl lis UScil to ilcillolisl I'.-lIc tll.Ml ccllaill species of 

 ;iii1s ii^e liiiiil ;is ;i I;iii(1iii;m'1<. In llie relies represented 

 l)\- lliis pliolournpli llie li^iil \\;is sliil'leil from >iile lt> 

 <i(|e. Later liulits were placed permanently (ni liotli sides; 

 hnt these were so connecti'ij that w lien one was liiilited 

 the otiiei- was antoniatically e\t iiiuni.--lie(l. A, heat lilter. 

 r>. electric liuht. ( ', niii'ror Tor \iewinu- the lowei' side of 

 1 he indineil plane. < >, .lanet nest. 



