S000 
X11 
Mr. HENWooD believed that some masses of tin which looked 
very much like weights, had been found near St. Austell; and 
that they were mentioned and figured in Borlase’s Nutural History 
of Cornwall. He remembered the opinion given by Mr. Poole as 
to the correspondence, in weights; but he was. afraid that the 
evidence which he should have to adduce, would not bear out the 
theory ; though he would not at present say so positively. He 
believed, however, that the weights were not multiples of the 
Attic, as had been supposed. 
Dr. BaruAm believed that Mr. Poole affirmed that some of 
the blocks weighed, respectively, a talent and a half talent. 
Dr. BARHAM read the following paper and tabulated results 
from Mr. DymonD, of Falmouth :— 
Comparison of the Temperatures of the Air and Sea at Falmouth in 1872. 
Observations on the Temperature of the Sea at Falmouth were com- 
menced in the Autumn of 1871 and were continued throughout the following 
year, and Iam therefore enabled to give the results of one year’s work. It 
was at first proposed to make the Observations in Falmouth Harbour, about the 
time of High Water; but it soon became apparent that results obtained in 
the Harbour, or near the shore, were almost worthless. Experiment proved 
that a difference of several degrees of Temperature existed within very small 
limits of space, and it was therefore determined before the end of 1871 to 
make the observations in the open sea, at distances varying from half a 
mile to three or more miles from the nearest land. Probably about one mile 
would be pretty nearly the average distance of the point of observation from 
the shore. During the months of January, February, and March, the number 
of observations averaged 16 per month, but subsequently the average was 
nearly 26 per month. The variation of temperature from day to day being 
exceedingly small (only once amounting to 2°), this number of observations 
may be considered ample to give satisfactory results. The instrument 
employed is a ‘‘ Standard” by Casella, tested at Kew, and was immersed to a 
depth of 6 feet below the surface, being suspended for a sufficient time at 
that depth by means of a float. The copper case of the instrument brings 
up water in which the bulb remains immersed whilst the reading is taken. 
In the following Table are given the results of the observations ; and the 
corresponding air temperatures, as recorded at the Falmouth Observatory, are 
added, with columns of differences. The sign minus is prefixed when the sea 
temperature is less than that of the air, and the sign plus when it is greater. 
In every month the maximum temperature of the sea was less than that 
of the air, the greatest difference being 10°-7 in June, and the least 2°-3 in 
November; the mean difference between the monthly maxima was 6°:3. On 
the other hand the minimum temperature of the sea was in every month 
very considerably higher than that of the air, the largest excess being 16°-3 
in March (which was a very cold month on land), and the least 6° in June 
and July. The mean difference between the minimum temperatures was 
110-5, being nearly double that between the mean maxima. 
As regards the mean temperatures it will be observed that the sea was 
warmer than the air in every month except June and July, when it was 1°-5 
and 0°°9 colder. Speaking generally, the air and sea had nearly the same 
mean temperatures from May to September inclusive, the difference in those 
