CONTENTS. 



APRIL to JUNE, 1828. 



Page 



Memoir on a New Calculation of the Latitudes of Montjouy and 

 Barcelona ; being a Supplement to the Base du Systeme Me- 

 trique. By J. N. Nicollet, of the Royal Observatory, Paris . 237 

 On the Annealing of the Specula of Reflecting Telescopes. By 

 J. Mac Culloch, M.D., F.R.S., &c. ... 255 



Comments on Corpulency. By William Wadd, Esq., F.L.S. . 268 

 Experiments on Heated Iron, in reference to the Magnetic and 

 Electric Fluids. By William Ritchib, A.M., Rector of the 

 Royal Academy at Tain . . . .288 



Modem Improvements in Horticulture . . .291 



De rinfluence des Agens Physiques sur la Vie. Par W. F. Ed- 

 vizards, M.D., &c. ...... 308 



On Saline Manures. By C. W. Johnson, Esq. . . 313 



A Copy of the Law in relation to Weights and Measures recently 



established in the State of New York . . .319 



Remarks on the Ruins at Palenque in Guatemala, and on the 

 Origin of the American Indians, with a note on Fossil Remains. 

 By John Ranking, Esq. ..... 323 



Comparative History of America and Tartary . . 35S 



Contributions to Experimental Chemistry . . .371 



Earthquake in Colombia, November 16, 1827 . . . 379 



Native Sulphate of Alumine, or Davite . . . 382 



Description and Analysis of a Mineral Water existing in the 

 Andes, with a Test for Iodine .... 384 



Earthy Bitumen, called Murindo .... 387 



On the Mechanism of the Act of Vomiting. By Marshall 



Hall, M.D., F.R.S.E., &c. &c. ... 388 



Illustrations of Nature ; or, the Arrangement of Physical Exist- 

 ence, indicated in Outline . . . .392 



Account of a New Hygrometer, by George Gumming, M.D. . 402 

 Report of the Commissioners appointed by His Majesty to inquire 



into the State of the Supply of Water in the Metropolis . 405 



Proceedings of the Royal Institution of Great Britain . .417 



Courses of Lectures delivered at the Royal Institution during the 



session . . . . , . 436 



Astronomical and Nautical Collections. 



i. Astronomical Chronology, deduced from Ptolemy, and his 



Commentators . . . . . .442 



ii. Principal Lunar Occultations of the fi"xed Stars, calculated 

 for the Royal Observatory at Greenwich. By T. Hen- 

 derson, Esq. . . . . .463 



