Hygrometer II. 1894. Spring. 

 1894. March 17. Corr. = — 2% (sat) on board 



— Apr. 2. „ —8 - (sat) — =— 



— - 4. „ —2 - (sat) — '- 



Hygrometers I and II, from June, 1895. 



In the winter, the hygi'ometers were often covered with hoar-frost, and 

 it was necessary to have them thawed and cleaned. This operation did 

 not seem to affect their reading in any appreciable degree. When a hygrometer, 

 after having been cleaned, was brought out into the open air, it sometimes 

 showed too low, but soon attained its true working position, and the reading 



