CONTENTS — {continued) . 



PAGE 



II. On the Molar Teeth, lower Jaw, of Macrauchenia patachonica, Ow. By 



Professor Owen, F.R.S 454 



III. Researches into the Chemical Constitution of the Opium Bases. Part L — 

 On the Action of Hydrochloric Acid on Morphia. By Augustus 

 Matthiessen, F.R.S. , Lecturer on Chemistry in St. Bartholomew's Hos- 

 pital, and C. E. A. Weight, B.Sc 455 



IV. Researches into the Constitution of the Opium Bases. Part II. — On the 



Action of Hydrochloric Acid on Codeia. By Augustus Matthiessen, 

 F.R.S., Lecturer on Chemistry in St. Bartholomew's Hospital, and C. R. 

 A. Weight, B.Sc '. 460 



V. A Preliminary Investigation into the Laws regulating the Peaks and Hollows, 



as exhibited in the Kew Magnetic Curves for the first two years of their 

 production. By Baleoue Stewaet, LL.D., F.R.S., Superintendent of the 

 Kew Observatory 462 



VI. On a new Astronomical Clock, and a Pendulum Governor for Uniform Mo- 



tion. By Sir William Thomson, LL.D., F.R.S 468 



Eeeata to Vol. XVII. 



Page 127, line 20, for retiring read returning. 

 „ 210, bines 13 and 14 from bottom, for Coron read Carn. 

 „ 345, line 8 from bottom, for - 157"'156 read + 157"\L56. 



A 



TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET. 



