Monday y \Qth Aitril 1855. 



PAGE 



Notice of Some new Forms of British Fresh-Water Diato- 

 macesc. By William Gregory, M.D., Professor of 

 Chemistry, . . . . . 306 



On Glacial Phenomena in Peebles and Selkirk Shires. By 



KoBERT Chambers, Esq., &c., . . . 308 



Preliminary Notice on the Decompositions of the Platinum 

 Salts of the Organic Alkalies. By Thomas Anderson, 

 M.D., Regius Professor of Chemistry in the University 

 of Glasgow, . . . . ■ . 309 



On the Volatile Bases produced by Destructive Distillation 

 of Cinchonine. By C. Greville Williams, Assistant 

 to Professor Anderson, Glasgow University, . 314 



Monday, SOth April 1855. 



Remarks on the Coal Plant termed Stigmaria. By the Rev. 



Dr Fleming, . . . . .316 



On Errors caused by Imperfect Inversion of the Magnet in 

 Observations of Magnetic Declination. By William 

 Swan, Esq., . . . . .318 



On the Accuracy attainable by means of Multiplied Obser- 

 vations. By Edward Sang, Esq., . . 319 



