GUERNSEY COUNTY (OHIO) METEORITES. 327 



" These data give the meteor a height of forty-one miles over 

 the northern boundary of Noble County ; a diameter of three 

 eighths of a mile; and a relative velocity of nearly four miles 

 a second. The results agree sufficiently well with those before 

 given." 



The accompanying map (fig. 1), made by Prof. Evans, shows 

 the region over which the meteorite was observed to pass, and 

 the conclusion to which he arrived is as follows : It was seen 

 over the eastern part of Washington County (about lat. 39° 27', 

 long. 81° 8'), at a height of forty miles nearly. It was last seen 

 over the north-western border of JSfoble County (about lat. 39° 

 51', long. 81° 34'), at a height of thirty-eight miles nearly. Its 

 velocity relative to the earth's surface, was three to four miles 

 a second. 



TEMPERATURE OF THE STONES. 



Several of the largest stones were picked up ten minutes 

 after their fall, and are described as being about as warm as a 

 stone that had lain in the sun in the summer. One fell among 

 dry leaves that covered it after it had penetrated the ground. 

 The leaves, however, showed no evidence of having been heated. 

 No appearance of ignition was discovered in places or objects 

 with which the stones came in contact at the time of their fall ; 

 so that their temperature must have fallen far short of redness, 

 while it may not have reached that of 200°. 



SIZE AND VELOCITY. 



I have no data upon which to calculate either of these. 

 Prof. Evans, however, as just quoted, calculates from the data 

 above given that its size was three eighths of a mile and 

 velocity four miles a second. 



While I may furnish no more reliable computations from the 

 data obtained, I may be excused a short criticism on the above 

 results to prevent too hasty conclusions being formed. 



As regards the supposed elevation of forty miles when the 

 first reports were heard, I would simply ask the question, Is it 

 possible, with the established views of the conduction of sound 

 by rarefied air, that any conceivable noise produced by a mete- 

 orite forty miles distant from the earth, in a medium quite as 

 rare if not rarer than the best air-pump can produce, would 



