206 
FIFTH REPORT— 1S35. 
We observe in this Table that the approach of the branch E A 
at night to a semi-parabola is very close, the differences not 
being- in any case two tenths of a decree of Fahrenheit. In the 
morning branch A B and noon branch B D the differences are 
somewhat more considerable, but still not so great as to destroy 
the approximation. In the afternoon branchy however, D E the 
deviations amount in one instance to more than eight tenths of a 
degree, and are too considerable to warrant this branch being 
taken as a semi-parabola. Whether more extended observations 
will tend to reconcile these differences is yet to be seen. 
It is not unworthy of remark that although in the results of 
Dr. Brewster’s inquiries the deviations did not in any case exceed 
a quarter of a degree of Fahrenheit, yet the differences, as at 
Plymouth, were greatest in the afternoon branch. 
I hope at no distant period to present to the Association the 
results of the hourly observations for five complete years, after 
which it is intended that the register shall close. This Report, 
at present necessarily limited, may then probably admit of further 
extension and correction, so as to obtain better approximations 
than those arising from two years observations only. 
Plymouth, July 20th, 1835. 
