186 



Dr. R. W. Coppinger on [Mar. 14, 



the house varied but half a decree during the course of the experi- 

 ment, and the thermometer YY showed a rise of only o, 75, which is 

 small when compared with its short distance (5 inches) from the 

 flame. The results, therefore, afforded by Table VIII may be consi- 

 dered highly satisfactory. 



I refrain from making any general observations or drawing any 

 special conclusions as to the subject of this paper, but simply submit 

 the above few observations with the hope that in abler hands than 

 mine, the facts which they contain may be made to add something to 

 our knowledge of the conductive properties of ice. 



I. Fresh- water Ice. Flame 6 inches from nearest Thermometer. 

 Temperature of outer air = — 37°. January 3, 1876. 



Time. 



Ther. 1. 



Ther. 2. 



Ther. 3. 



Ther. 4. 



Tempera- 

 ture in ice 

 house. 



Ther. 

 Y.Y. 



hours min. 





-27-75 





-23 00 











-27 



9 8 



-26-75 



-24 -00 



-24 



9 23 



-26 -00 



-27-00 



-23 5 



-23-00 



-23 



-25 



9 38 



-24-5 



-26-25 



-23-00 



-23 -00 



-23 



-24 5 



9 53 



-22 5 



- 25 -25 



-22 5 



-22 -00 



-22 



-23-5 



10 8 



-21 -5 



-24-75 



-22-00 



-21 -5 



-22 



-23 



Range .... 



5-25 



3-00 



2-00 



1-5 



2 



4 



II. Fresh-water Ice. Flame 6 inches from nearest Thermometer. 

 December 28, 1875. 



Time. 



Ther. 1. 



Ther. 2. 



Ther. 3. 



Ther. 4. 



Tempera- 

 ture in 

 house. 



Ther. 

 Y.Y. 



hours min. 



5 55 



6 10 

 6 25 

 6 40 

 6 55 



Range .... 



-24 -5 

 -23 5 

 -22 

 -21 

 -19-5 



-25° -25 



-24 



-24 



-23 



-22-75 



o 



-22 



-21-5 



-20-75 



-20-5 



-20 



-21-25 



-21 



-20-25 



-19-75 



-19-75 



-25° 25 

 -25 25 



o 



-24-5 

 -23 5 

 -23 

 -23 

 -22 



5 



2-5 



2 



1 -5 



o-o 



2-5 



