6 CONDITION OF THE SUN'S SURFACE. [MEMOIR IV. 



Subsequently, in the Philosophical Magazine (April, 

 1863), a memoir appeared, under the title of " Contribu- 

 tions toward the History of Spectrum Analysis and of 

 the Analysis of the Solar Atmosphere," by M. Kirchoff. 

 In this all allusion to the foregoing memoirs is avoided. 



