( xxix: *) 
Ga Qy No Th. BEN oS 
0.F 
VOLUME Ii. 
NO 
I. ALETTER from Dr. B. Franklin, to Dr. Ingenhaufz, 
Phyfician to the Emperor, at Vienna, on the Caufes and 
Cure of Smokey Chimneys, 
II. Explanation of an Optical Deception, by Mr. Rittenhoufe, 
III. Defcription of the White Mountains in New-Hampfbire, by 
the Rev. Mr. Jeremy Belknap, 
IV.. Defeription of a remarkable Rock and Cafcade, near the 
Weftern Side of the Youghiogeny River, by Tho. Hutchins, E/7. 
V. Letter to Mr. Nairne, of Wigan from Dr. Franklin, pro- 
pofing a flowly fenfible Hygrometer for certain Purpofes, 
VI. Defcription of anew Stove for burning of Pitcoal, and con- 
fuming all it’s Smoke, by Dr. Franklin, 
VII. 4 Theory of Lightning and Thunder Storms, by Andrew- 
Oliver, E/g. of Salem, in the State of Maffachufetts, . 
VII: Theory of Water-Spouts,. by Andrew Oliver, E/q7. 
IX. Experiments on Evaporation, and Metecrological Obferva- 
tions made at Bradfield in New-England, by the Rev. Samuel 
Williams,. 4. M. 
X. A Letter from J. Madifon, E/g. to D. Rittenhoufe, E/7. 
containing Meteorological Obfervations, 
XI. Defcription of a Machine for meafuring a Ship’s Way thro’ 
the Sea, by ¥, Hopkinfon, £/7. 
XII. 
Page.- 
37 
50 
Ske 
Si: 
7A: 
1o1t 
118 
123 
159 
Jali 
