Loi 







A YEAE IN SCIENCE 75 



highest temperature recorded on the map? What rela- 

 tion does temperature have to the high and low area 

 regions ? 



Choose a map, give its date, and record for your 

 locality, the temperature, direction of the wind, veloc- 

 ity of the wind, barometer reading, state of the sky, 

 and kind of precipitation, if any. 



CHAPTER XII 



SOILS 



Exercise 45. Water Capacity of Soils. 



Object: To determine the capacity for water of 



different soils. 



Apparatus 



Sand Leaf-mold 



Clay Tin cans 



Loam Balance and weights 



Directions: Expose the different soils used in this 

 ercise to the room air for a period of two days. 

 At the end of that time find the weight of the can. 

 The can should have a number of holes in the bottom. 

 Fill the can two thirds full of the air dried sand, and 

 find the weight of both the can and the sand. Then 

 compute the weight of the sand. Thoroughly saturate 

 the sand with water and set it aside for about two 

 hours. Again weigh the can with its contents. From 

 this result subtract the weight of the can and dry 

 soil. The difference represents the amount of water, 



