CONTEN IS— (continued). 



April 26, 1877. 



PAGE 



I. On the Nature and Origin of the Beds of Chert in the Upper Carboniferous 

 Limestones of Ireland. By Prof. Edwabd Hull, M.A., F.B.S., Director 

 of the Geological Survey of Ireland. With Chemical Notes, by E. T. Habd- 

 man, E.C.S., of the Geological Survey of Ireland 163 



II. Besearches on Emeralds and Beryls. — Part II. On some of the Processes 

 employed in the Analysis of Emeralds and Beryls. By Geeyille 

 Williams, E.E.S 165 



III. On Repulsion resulting from Badiation. — Preliminary Note on the Otheo- 



scope. By William Ceookes, F.R.S. &c 176 



IV. On the Inferences to be drawn from the Appearance of Bright Lines in the 



Spectra of Irresolvable Nebulae. By William Hoggins, D.C.L., LL.D.. 

 F.R.S. 179 



List of Presents 181 



On the Temperature of the Human Body in Health. By Sydney Ringeh, M.D., 

 Professor of Therapeutics at University College, London, and the late 

 Andbew P. Stuabt, M.E.C.S 186 



m 



EEEATUM IN No. 179. 

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