ELISHA MITCHELL SCIENTIFIC SOCIETY. 43 



Contour of Ground — The ridges in the track o! the storm present 

 their more gentle slopes to the direction from which the tornado was 

 approaching, the eastern faces being much more abrupt. On the 

 western slopes the trees were blown down with their tops to the 

 east, but on the more abrupt eastern slopes they were crushed to 

 the ground lying in every direction, and s. lintered as if the force 

 had been applied perpendicularly. Generally the greatest destruc- 

 tion was observ^ed on the abrupt eastern slopes and in the hollows 

 where ground was lowest. 



Velocity — It has been very difficult to get the exact time the storm 

 left Newton and passed the various points on the way, but from the 

 best information at hand it left Newton at 5 o'clock p. m,, and in 

 the last dwelling destroyed where it crossed the W. N. C. Railroad, 

 two miles and a half east of Statesville, a clock stopped at 5 :43 p. 

 m. Showing if these data are correct that its velocity was thirty 

 and seven-tenths miles per hour. 



Soon after the hail storm, I learned that many substances had 

 been thrown outside of the track of the cyclone far to the north of 

 it. On inquiry, I ascertained from more than one source of un- 

 doubted reliability, that many of the hail stones contained small 

 quantities of clay and sand. The general course of the storm agrees 

 exactly with that laid down as generally followed by similar storms 

 in this latitude, by Prof, Elias Loomis, of Yale College. 



Statesville, N. C, April 5th, 1884. 



ACTION OF AMMONIA OF LEAD IODIDE, 



J. L. BORDEN. 



Lead iodide was prepared by precipitating pure lead nitrate with 

 pure potassium iodide and thoroughly washing and drying the pre- 

 cipitate. In the first set of experiments three portions were taken. 

 One was heated on the sand-bath ten hours, the second a similar 

 time on the water-bath, the third was covered with ammonia solu- 

 tion and set aside for three days at a temperature of 15^20^ c. In 

 the first two instances no precautions were taken to keep a strong 

 solution of ammonia over the iodide. In the analyes, lead alone was 



