EGYPT JAN AGRICULTURE. 



below this the temperature gradually rises towards the 

 centre of the earth. In Europe, the belt of constant 

 temperature is about 24 metres under the surface ; to a 

 depth of from O6 to I/O metre the temperature of the soil 

 shows daily variations. In the following table the average 

 monthly atmospheric and soil temperatures are given, the 

 latter at depths of thirty, sixty, and one hundred and 

 twenty centimetres. 



SOIL TEMPERATURES. 



A rise in atmospheric temperature is followed shortly 

 afterwards by an increase in temperature at 30 cms. and 

 still later by an increase at greater depths. 



