Winds. 67 



the spire, which was 300 feet high. They 

 were streaming with a strained, quivering 

 motion perpendicularly upwards. A heavy 

 cloud was passing overhead at the mo- 

 ment and as it passed, the flags followed 

 the cloud and then gradually dropped into 

 comparative quietness. The same phenome- 

 non was noticed several times. As the cloud 

 approached, the upper banner began to feel 

 its influence and streamed towards it, against 

 the direction of the wind, which still blew as 

 before, steadily on all below. As the cloud 

 came nearer, the vehement quivering and 

 streaming motion of the flags increased ; they 

 began to take an upward perpendicular di- 

 rection into the cloud and seemed almost 

 tearing themselves from the staves to which 

 they were fastened. Again as the cloud 

 passed, they followed it as they had previ- 

 ously streamed to meet its approach, and 

 then dropped away as before, one or two 

 actually folding over their staves. All the 

 other flags at the lower elevation did not 

 show the least symptom of disturbance." 

 In this phenomenon we observe the operation 

 of two of the wind-producing causes just 

 mentioned, viz. : a wind arising from purely 

 local causes, and of limited extent, occurring 



