-37- 



2 5° and 35° gave retes that aro markedly lov/er than those 

 for 28° and 31°, and that temper at vires 21°, 17° and 13° 

 gave still lower rates, these being progressively lov;er 

 with lov/er temperatiires. These grand averages will 

 receive attention below. 



