Miscellaneous Contributions by Dr. Hare. 



moistened. Under these 

 circumstances, if the bag, 

 after severe compression 

 by the hand, be suddenly 

 released from pressure, a 

 cloud will appear within 

 the bulb, adequate in the 

 solar rays, to produce pris- 

 matic colors. At the same 

 time the thermometer will 

 show that the compres- 

 sion is productive of 

 warmth — the relaxation of 

 cold. 



The tendency in the at- 

 mosphere to cloudiness, at 

 certain elevations, may be 

 ascribed to the rarefaction 

 which air inevitably under- 

 goes, in circulating from 

 the earth's surface to such 

 heights. 



5. Apparatus for Illustrating Capacities for heat. 



Let the ves- 

 sels A, B and 

 C be supplied 

 with water 

 through the 

 tubeT. The 

 water will 

 rise to the 

 same level in 

 alL Of course 

 the resistance 



made by the water in each vessel to the entrance of this 

 liquid will be the same, and will be measured by the height 

 of the column of water in the tube T. Hence if the height 

 of this column were made the index of the quantity received 

 by each vessel, they would all have received the same quan- 

 tity. But it must be obvious, that the quantities severally re- 

 ceived, will be as different as are their horizontal areas. Of 



