5445 



Singular Rainboiio, 



reduced to 7°.* Of course, the cold produced in this manner 

 was speedily dissipated after the appearance of the sun above 

 the horizon ; and the ensuing day proving equally fine v^^ith 

 those that had preceded, I was enabled to observe the utmost 

 intensity of the sun*s rays, which, at 1 p. m., had raised to the 

 height of 1 05° the same thermometer which at 6 a. m. was 2° 

 below the freezing point ; so that in seven hours the vegetation 

 of that spot experienced a range of temperature equalling 75°. 

 At the time of the above observation, the temperature of the 

 air was 63°, indicating the force of solar radiation to have 

 been 42°. 



The first week in April presented a striking contrast to the 

 last week in March. On the 2d of that month, being only 

 four days after the temperature of the air had risen to 69°, 

 the thermometer was never higher than 34°; and snow and 

 sleet together, accompanied by a keen wind from the north- 

 east, continued falling without interruption the whole day. 

 This was followed by several nights of very severe frost, inso- 

 much that, in one instance, the morning of the 5th, the ther- 

 mometer, exactly at sunrise, stood as low as 25°; whilst 

 another on the grass, placed as on the occasion before men- 

 tioned, was depressed to 20^*. Soon after this, however, the 

 weather again became seasonable. 



I have only to add, in concluding this subject, that the 

 whole of the above observations were made at SwafFham Bul- 

 beck, the situation of which place is about 8 miles E. N. E. of 

 Cambridge. 



Art. XIII. 



Sir, 



Notice of a singular Appearance of the Rainbow, 

 By E. G. 



( 



133 



The following account of a singular appearance of the 

 rainbow {fig. 133.), which was seen 1 4th September last, at 



a quarter past five 

 P.M., on the shores of 

 the Solway Frith, in 

 Cumberland, may per- 

 haps be interesting to 

 some of your readers, 

 should you think it 

 worth insertion in your 

 Magazine : — 



* This circumstance is in exact a£;reement with the observations of 

 Wells. {Essay on Detv, p. 43. and 6 1 .) 



