II CONTENTS. 



Arfr. PAGE 



XII. Facts relative to Gold. Extracted from a Memoir 

 read to the Institute, by M. Pelletier 117 



XIII. On the New Hygrometer. By J. F. Daniell, Esq., 

 F.R,S., &c )23 



XIV. Meteorological Journal for the Months of June, July, 

 and August, 1820 144 



XV. Astronomical and Nautical Collections, 



No. III.— 



i. Tables subservient to the Calculation of Lunar Oc- 

 cultations, viz., A Table of the Places of all the Stars 

 not below the Fourth Magnitude, that are liable to 

 Lunar Occultations. 2. A Table shewing the Loga- 

 rithms of the Corrections in Seconds, to be applied 

 with the proper signs of the Sines. 3. Occultations 

 for the different places of the Moon's Node. 4. Ex- 

 planation of the Second Table. 5. Computation of 

 the Elements for an Almanac. 6. Computation of 

 a Visible Occultation 145 



ii. Errors of the Lunar Tables, deduced from 4068 Ob- 

 servations, computed by order of the Board of Lon- 

 gitude , * , . . 166 



XVI. MISCELLANEOUS INTELLIGENCE. 



I. Mechanical Science. 



§ Optics, the Arts, Sfc. 



I, On the Structure of the Diamond. 2. Optico-Meteoro- 

 logical Question. 3. Double Refraction of Minerals. 

 4. Restoration of the white in Painting. 5. Distant 

 Visibility of Mountains. 6. Earthen- ware Reflectors. 

 7. GasTube 167 



II. Chemical Science. 



§ Chemistry. 



1. Veratrine, a. new Vegetable Aleali. 2. Benzoic Acid. 

 3. Antiseptic Power of the Pyroligneous Acid. 4. Pu- 

 rification of Pyroligneous Acid. 5. Acids of Manganese. 



