CONTENTS. 
Answer to ** Remarks on Mr. Rippue’s Claim to the Invention 
of a new Method of determining the Latitude.” .. 103 
A Communication of a singular Fact in Natural — 105 
Particulars of a Fact, nearly similar. ‘ 106 
On the Use of Shot Cartridges. .. .. ng «5 Oy 
Report of a Committee of the Academy of Natural Sciences of 
Philadelphia, on a new Hydrostatic Balance invented by 
IsaraH LUKENS. ve oe ee . Pay, ie 
Description of a Hydrostatic Balance, by hi the Specific 
Gravities of Minerals may be ascertained without Calculation. 
109 
Notice respecting a Volcanic Appearance in the Moon, 113° 
The first Portion of a Catalogue of \800 zodiacal Stars. 114 
On the Appearance of Meteors, Parhelia, and Prnceniaiay as 
Prognostics in general of Wind and Rain. .. 127,198 
A Refutation of Mr. HEravatn’s Mathematical Inquiry into 
the Causes, Laws, Se. of Heat, Gases, Gravitation, Sc. 130, 
260 
Application of the Calculation of Probabilities to the ae 
Operations of the Meridian of France. vie 133 
On promoiing the early Puberty y of Mepe and Pear Trees when 
raised from Seed. .. Se amity ies 
Contribution to the History of Bleeericiti er Ve pot honed 
Observations on Sir EVERARD Homr’s Paper on the black Rete 
mucosum of the Negro. .. ee we wy 140 
On the new Method proposed by Dr. Youna for caculating the 
Atmospherical Refraction. .. yeahs oe TOR 
On Mr. Carnot’s new System of Defence of Places by ty what 
he calls Vertical Firing. | ae 176 
On a new graphical Method of reducing the coe Distances. 
178 
On Shooting Stars and Meteors. es +s apt ee 
An Address to aPhrenologist .. ais a ves A L87 
Tables of the Longitude and Altitude of the Nonagesimal De- 
gree of the Ecliptic. .. ba oe oo See 
On Mr. Ripp1e’s Claim to the Invention of a new Method of 
determining the Latitude. .. oe a 200 
On Mr. Purxins’s Conclusions with regard to the Capbrctaiinlin 
