322 Extracts from the Journals. [April, 



WELL AT GRENELLE, NEAR PARIS. 



The Artesian well, at Grenelle, is the deepest but one from 

 which water is obtained. The shaft or tube extends to the depth 

 of 1,794, mostly in chalk. The temperature of the water is 

 82° F., 31° above the mean temperature of Paris. The water 

 rises to the surface, and is discharged at the rate of 600 gallons 

 per minute. 



STARCPL 



It has been recommended to extract the starch from diseased 

 potatoes, and to be used as food. In consideration that starch by 

 itself is not a material which serves for the support of the animal 

 frame, this object is not regarded by others as worthy of consider- 

 ation. 100 lbs. potatoes contain 74 lbs. water, fibrous matter 8 

 lbs., starch 16, gluten 2 lbs. An animal fed on starch alone dies 

 of starvation. 



LUTE FOR JOINING OF TUBES AND RETORTS. 



Make a saturated solution of isinglass in acetic acid, and such 

 that it will set into a solid on cooling. Add a little alcohol to 

 prevent its spoiling. Keep in well-stopped bottles. Spread on 

 moistened paper cut into slips. It may also be spread on bladder 

 to promote its adhesion. — Bcrthier Med. Gazette. 



METEOROLOGICAL OBSERVATIONS. 



BY PROF. C. DEWEY. 



[Extracted from the Report of the Regents of N. Y., 1846.] 



Dark Color of Clouds over Lakes. — This appearance is com- 

 monly noticed. If a cioud lies over th^i Lake Ontario north of 

 Rochester, its color is dark blue, or nearly black, whether the 

 other parts of the concave are clouded or not. This is doubtless 

 owing to the less reflection of light from the water, compared 

 with that from the land. The appearance is more distinct in 

 winter, when the ground is covered with snow, as there is then a 

 greater difference in the reflection from water and land. I sup- 



