Messrs Coldstream and Foggo's Observations. 359 
7th. — Several large and dense nimbi passed to-day from SW. discharging at 
intervals heavy showers of rain. At 5 p. m. a very fine primary rainbow was seen, 
within the interior circumference of which were two perfect supernumeraries of 
great brilliancy. They were of unequal breadth : the second was narrower than 
the first ; and both taken together, scarcely equalled in breadth the primary. In 
each, all the spectral tints were distinguishable. Now and then, as the cloud 
moved on, a third set of colours was perceived in detached portions ; but a 
third bow was never completed. During this interesting display, another phe- 
nomenon presented itself, namely, the convergence of the solar rays , which was 
seen most distinctly, owing to the deep colour of the nimbus by which the rain- 
bow was formed. The beams filled the whole space included by the bow, and 
passed beyond its circumference to a considerable distance. The effect of the 
whole was exceedingly rich. 
1 6th — For several days past, we have had variable winds, high tempera- 
tures, and steady pressure. To-day, the wind veered from W. to E. and from 
E. to W. repeatedly. The minimum temperature was 54° ; maximum 76°. 
Barometer 30,195. 
The following observations were made on Solar Radiation : 
Hour. 
Ther. in shade. 
in sun. 
8 h A. M. 
69°.0 
110°.0 
Clear ; very fine. 
8 30 
... 
114.0 
Ditto ; wind W. 
9 
71.5 
114.0 
Ditto. 
9 30 
... 
116.0 
Ditto ; wind E* 
10 
73.0 
118.0 
A few cumuli. 
11 
74.0 
119.5 
Ditto. 
12 noon, 
74.0 
120.5 
Ditto ; wind W. 
2 P. M. 
65.0 
116.0 
Wind E. brisk. 
27 th, 
— Much rain fell this day ; wind E. Immense cumulo-strati and nimbi 
at an elevation of 
more than 2000 feet. 
The following are the few additional 
observations we had opportunities of making on Solar Radiation : 
Ther. in shade. 
In sun. 
17 th. 
9 A. M. 
59°.0 
119°.0 
1 Long cumuli. 
18 th, 
9 A. M. 
58.0 
104.0 
Much smoke in the sky. 
28th , 
9 A. M. 
56.0 
106.0 
Cirri. 
• •• 
4 P. M. 
61.0 
106.0 
Cirri. 
JULY. 
Results. 
1. Temperature. Fahr. Ther. 
Mean of the month, 60°.960 
Maximum by Register Thermometer, 81.000 
Minimum by ditto ditto, 45.000 
Range, 36.000 
Mean of the extremes, 63.000 
2. Pressure. Inches. 
Mean of the month, 30.081 
Maximum observed, 30.300 
Minimum observed, 29.720 
ftange, 0.580 
