CONTENTS. Vll 



ARTICLE PAllE 



XXVIII. — On Indigo-Blue from Polygonu/n tindoriu)ii and other 



Plants. By Edward ScHUNCK, Ph.D., F.E.S 218 



XXIX.— On Siliceous Fossilization. By J. B. Hannav, F.R.S.E., 



Assistant Lecturer ou Chemistry in the Owens College... 234 



XXX.— On a New Calorimeter. By J. B. Hannay, F.R.S.E., As- 

 sistant Lecturer on Chemistry, Owens College 242 



XXXI. — On Aurin, By R. S. Dale, B.A., and C. Schorlemmer, 



F.R.S 248 



XXXII.— The Origin of some Ores of Copper. — Part II. By Ciiarle.s 



A. BuRGiiARDT, Ph.D., The Owens College 253 



XXXIII. — On some Coloriinetrical Experiments. By James Bottom- 

 ley, B.A., D.Sc 258 



XXXIV. — The Distribution of Ammonia. By R. Angus Smith, Ph.D., 



F.R.S. &c 267 



