NATURAL HISTORY. 



FAIL OF SNOW. 



ADVANCE OF SPRING. 



FALL OF SNOW, AND DAYS OF SLEIGHING IN TEN SUCCESSIVE YEARS. 

 Continued from page 12, Part I. 



ADVANCE OF SPRING FOR ELEVEN SUCCESSIVE YEARS. 

 Continued from page 13, Part I. 



Of our migratory birds, the Bob-o-link, 

 Icterus agripennis, is undoubtedly one of 

 the most regular in its return in the spring. 

 In my account of that Bird, Part I, p. 70, 

 it is said to make its appearance in the lat- 



ter part of May. But from observations 

 since made, and from information derived 

 from others, I am satisfied that its arrival 

 in Vermont very seldom varies more than 

 t-wo or three days from the 12th of May. 



Closing and Opening of Lake Champlain 

 and RunniTig of the Line Steamers.— 

 Continued from page 14, Part I. 



the lake opposite to Burlington. With the 

 exception of 1835, this part of the lake has 

 never become frozen entirely over earlier 

 than the 15th of January, within the last 

 thirty-six years. The mean time of closing 

 for that period would fall on the 1st day of 

 February. During four of the years it did 

 not close at all. The narrower parts of the 

 lake usually become frozen over so as to 

 interrupt navigation, through its entire 

 length, early in December, and most of the 

 bays become covered with ice about tlie 

 same time. 



The closing and opening of Lake Cham- 

 plain have reference to the broadest part of 



* Although the Line Boats commenced running so 

 late as the 3d of May, they were for several days 

 after that unable to proceed farther north than 

 Plattsburgh, on account of the ice. It was not till 

 the 6th that they were able to pass through the wliole 

 length of the lake, and then only by cutting through 

 the ice for a distance of nearly six miles. The boats 

 were not able to reach St. Albans till the 10th, and 

 ice remained in many of the bays up to that time. 



