BULLETIN 



OF THE 



ESSEX! I 3ST S T I T TJ T 



VOL. 4. SALEM, MASS., APRIL, 1872. No. 4. 



One Dollar a Year in Advance. 10 Cents a Single Copy. 



KEGULAR MEETING, MONDAY, MARCH 4TH, 1872. 



[ Continued.} 

 STORMS. 



Ill observations on an approaching "SfcBfBr^the eleva- 

 tion of 6,000 feet is important, inasmuch as the observer 

 is above the lower strata, the "storm-scud." Here he 

 may note the changes in kind and relative position of the 

 several cjoud strata from the moment the storm is seen 

 along the western horizon, two hundred miles distant, till 

 it shall envelop the lofty peak of Mount Washington. The 

 elevation of a storm moving east can be seen as far dis- 

 tant as New York City. 



When condensation advances but little faster than the 

 storm line, it is a more interesting study than when the 

 condensation is going on for days, and over a wide ex- 

 tent of country at the same time. If rapid and with the 

 storm, we notice at an immense height the "polar bauds" 

 of cirrus, lower, cirro-stratus, or cirro-cumulus. From 

 ESSEX INST. BULLETIN. iv 6 



