XXXVl 



KEPORT — 1869. 



1867. Dundee . 



1868. Norwich 



1869. Exeter . 



Lectures to the Operative Classes. 



Prof. J. Tyndall, LL.D., F.R.S. 

 Prof. Huxley, LL.D., F.R.S. ... 

 Prof. Miller, M.D., F.R.S 



Matter and Force. 



A piece of Chalk. 



Experimental illustrations of the 

 modes of detecting the Composi- 

 tion of the Sun and otlier Heavenly 

 Bodies by the Spectrum. 



