CLIMATOLOGY OF NEW HAMPSHIRE. 1 29 



the changes of' temperature, to this may be due the increase inland from 

 the oceaiL 



The following record shows the time of the closing and opening of 

 some of our lakes. That of Winnipiseogee is as follows : 



Closed with Ice. Clear of Ice. 



1867— December 19. i868— April 10. 



1869— January 19. 1869— April 28. 



1870— January 23. 1870— April 21. 



1871— January 14. 1871— April 10. 



1872— January 3. 1872— May 4. 



1873— December 17. 1873— May 4. 



Umbagog lake generally closes about November 1 5 ; — was entirely 

 clear of ice, April 28, 1871; May 10, 1872; May 11, 1873. 



Connecticut lake closes earlier and opens later, though the figures 

 given to me, but not reproduced, are not exact. 



The Phenomena observed on Mts. Moosilauke and Washington. 



In the summer of 1869, I proposed to Prof. Hitchcock to occupy the 

 summit of Mt. Washington the following winter, for the purpose of taking 

 meteorological observations. He heartily approved of the undertaking, 

 and made an effort to secure a building on the summit of that mountain. 

 In this, however, he failed ; but he did obtain permission for me to occupy 

 a building on the summit of Moosilauke. In late autumn, preparations 

 were made, and on the last day of the year of 1869, with Mr. A. F. 

 Clough as photographer, I ascended this mountain, and remained there 

 during the January and February following. The expedition was carried 

 out chiefly at my own expense. We found out many things that were 

 novel and interesting, and some that were new to science. The beautiful 

 frost-work of our mountain summits was here for the first time photo- 

 graphed and described ; and we experienced winds of greater velocity 

 than had ever before been measured. 



Our observations here made us still more desirous of spending a winter 

 on Mt. Washington. This we were able to do the following winter, 

 through the cooperation of Prof. Hitchcock, Mr. S. A. Nelson, the U. S. 

 Signal Service, and the seventy-five individuals and firms, besides railroad 

 corporations, that furnished material aid. The mountain has since been 

 occupied by the Signal Service, and last summer a building was erected 

 for the use of the observers. 

 VOL. I. 17 



