[ m 3 
reduced to Englijh , gives 29 Inches, 993. This agrees 
very well with a Diary communicated to the Society, 
containing 10 Months of the Year 1723, and Janu- 
ary 1724 j the Author of which found by Experi- 
ment, that in the Place where his Barometer was kept, 
the Mercury flood T ~ and ~ higher than at the Surface 
of the Sea, which was not far from his Habitation. 
The mean Height of the Barometer for thofe 10 
Months (leaving out the January following, which 
feems to he a very irregular Month) I find to be 29, 
S2y, to which adding -^ 4, it will give the mean 
Height at the Surface of the Sea 29, 97 y 5 fo the Dif- 
ference between thefe is only ,018, and therefore pro- 
bably may be near the Truth, but may hereafter be 
more exa&ly determin'd by Experiments. Then al- 
lowing about 90 Feet, or rather lefs, for each 10th of an. 
Inch in Height of the Mercury in fmaller Altitudes, or in 
greater according to the Tables calculated for that Pur- 
pofe, by Dr. Scheuchzer and Dr. Nettleton , and pub- 
lifh'd in the Tranf actions of this Society, /. c . & N c 3 8 8... 
you will have the Height of each Place pretty near, 
provided the Obfervations be carefully made, and con- 
tinued for a fufficient Time; for the yearly mean 
Heights in one of the Places in thefe Tables appear to 
differ near T a o - of an Inch in thefe two Years 5 and in 
moft of them, the laft of thefe two Years exceeds 
the firft, two or three Hundredths: The Barometer 
alfo ought not to be remov’d to a lower or higher 
Place. 
Upon the Thermometrical Tables, and thpfe of the 
Rain, I have at prefent no Remarks to make, but 
what are obvious on firft Sight 5 only that the Thermo- 
meters agree, efpecially as to the hotteft Days in the 
Year, 
