ABSORPTION SPECTRA. 



PLATE 21. 



.ei .p M 



n|!,:.l5,l: 



M .(^T .1^8 .S^B M .83 .n .SI .M .U .t;8 .47 M M . .><9 .(p 



.u .to .OS 



H(i. 81. 



FIG. 82. 



FIG. 83. 



FIG. 84. 



FIG. 85. 



FIG. 81. SEE NO. 175. NICKEL NITRATE. 



FIG. 82. SEE NO. 176. NICKEL SULPHATE. 



FIG. 83. SEE NO. 172. LITMUS, BLUE. 



FIG. 84. SEE NO. 172. LITMUS, RED. 



FIG. 85. SEE NO. 161. COBALT GLASS. 



"ELiOTVPE CO., BOSTON 



