1909.] PUBLIC DOCUMENT — No. 31. 65 



displayed from the flagstaff over the tower. The flags are five 

 in number, namely, a white flag, indicating fair weather; blue 

 and white, indicating local showers; blue, indicating rain or 

 snow ; white with black center, indicating a cold wave or a drop 

 of more than 20° in temperature for the next day, or the first 

 frost of the season. The first three read downward on the 

 staff. When any of them are displayed together, as white 

 above blue, it means fair followed by rain or snow. A trian- 

 gular black flag is the temperature flag, which displayed above 

 the others indicates rising temperature or warmer, and dis- 

 played below the others falling temperature or colder. The 

 cold-wave flag is never displayed with any of the other flags. 



The usual weekly snow reports are being sent to the Boston 

 office this season as heretofore and the voluntary observer's 

 reports are sent there monthly. 



A summary of the twenty years' records is nearly complete 

 and will be ready for publication soon after the close of the year. 

 I would recommend that it be published as a part of this 

 report. 



