LABORS OF THE JOINT COMMITTEE. 123 



33. Reading, Penn., 40 18' N., 75 55' W. (Observed by C. F. EGELLMANN, 



Esq., communicated by SAMUEL HITTER, Esq.) 



March 16th, cloudy, with N. W. wind at 2, P. M. Tem- 

 perature, 62, 17th, rain at 7, A. M., turning to snow at 7| ; 

 snow continued, with occasional rain, till the morning of the 

 18th, wind strong from N. E. all the time ; in the evening 

 it changed round to N. W. and was N. W. and W. next day. 

 On the 17th, the thermometer was from 34 to 33 all day. 



34. Philadelphia, Penn. 39 57 N., 71 11' W. (By JAMES P. ESPY, Meteo- 



rologist of Joint Committee.) 



March 16th, wind very gentle N. and clouds from S. W. 1 , 

 and cloudy at 7, A. M. ; wind got round to N. E. 1 before 2, 

 P. M., clouds still coming from S. W. 2 ; a slight sprinkle 

 of rain at 9, P. M. 



17th. On the morning of the 17th, at 7, it began to rain, 

 mingled with hail; it rained much during the morning, 

 and snowed much in the afternoon, wind and clouds from 

 N. E. ; storm increasing in violence all day, and continued 

 very violent all night, until 9, A. M., of the 18th, when it 

 began to abate, and at 1, P. M., it had nearly ceased snow- 

 ing ; wind still very strong N. E. A little snow in the af- 

 ternoon, and by 6, P. M., the wind had veered round to N. 

 by E., and gradually died away in the night ; and on the 

 morning of the 19th it was, with the lower clouds, N., very 

 gentle, and the upper clouds from the west moving quite 

 slow. 



The barometer was stationary on the 16th, at 29.91, and 

 fell on the 17th, from 29.93 at 7, A. M., to 29.78 at 9, P. M., 

 and was at its lowest, 29.68, on the next morning. The 

 thermometer ranged from 44 to 55 on the 16th, from 37 

 to 33 on the 17th, and was only 33 at 2, P. M. The dew 

 point was 38, or 17 degrees below the temperature of the 

 air on the 16th at 2, P. M. ; and at 2, P. M. of the 17th, it 



