made at Cambridge. SO® 



May 5. — Cloudy at times; warm and calm; in the everw 

 ing some cirrocvmiilus, with much cirr-ostralus and smoke- 

 like scud. Cloudy at niiiht. Thermometer midday Go*^; 

 il P.M. b5\ 



May 6. — Fine warm day, but cloudy and misty in the 

 morning; after it cleared, the haze continued, and large 

 masses of aimulus prevailed of mountainous appearance. 

 Therm, at 3 P.M. 6S^. In the eveninii much cirroslraius. 

 Therm, at 11 P.M. 51^. Wind northerly-. 



May 7 —Clouded morning ; various clouds ; warm day 

 when It cleared ; thunder-storms about, and some rain fell 

 here. Clear night, with thermometer at 5 P.M. 50". 



May 8 — Clouded early, with a mist like what in Corn- 

 wall is called the pride of the morning ; hnr day with cumuli 

 and cirrus above ; at night a faint halo round the moon. 

 The large clouds did not evaporate or disappear till late*. 

 Therm, at midday 67°. Midnight 33°. Wiud variable 

 and quiet. 



May 9. — Warm still day, with much cloud in the morn- 

 ing, and an appearance of nimbification at a distance, fine 

 red sunset when the clouds broke ; at night large confluent 

 cirrocunmlative masses. Thermometer 3 P.M. 69'. Mid- 

 night 56". 



May 10 — Warm close day with thick haze, through 

 which much cloud was seen, generally cumtdi, which in 

 the evening appeared copper-coloured through the mist. 

 At night there were cirrncumuli in beds, at considerable 

 altitude. Thermometer at 1 1 at night 53". 



May 11 — Overcast morning, and somewhat cooler. The 

 swift [kinmdoapus) made its first appearancef. In the course 

 of the day much cloud. No sun at limes, and showers in 

 the evening. Therm, at 1 1 P.M. 56^. 



• If the nocturnal descent of the watery particles depend only on their 

 comparative jjravity being increased by a diminwiion of calorific repulsion, 

 and the consequent uniting of tlie particles into minute drops of water; and 

 if their rc.scent in the morning depend on a correspondent Increase of 

 ievitT by the acquisition of calorific repulsion ; it would follow that water 

 wa» much more expan3ll)!c by heat llian airs; since, by an alteration of 

 temperature they were made at times much lighter, and at others heavier, 

 than the pa.ticles of air. 



f The swallow (hinuidr) Tiulicn) was seen in the middle of April ; and the 

 martlet (li'iuniti vriicn) at the latter end of April. It would be well if 

 nieieonilogiat-. would notice the earliest appearance of migratory birds in 

 their journal!, as the irregularities in their appearance maybe dependent 

 •a atmusphei ic causes. 



Corpi:* Christl College, Cambridge, ThOMAS FoBSTER, 



May 11, 1S13. 



WETEORO- 



