measuring rule
4.Through researching and studying the background of the latest scientific atomic theory,the paper tries to analyze the scientific method of measuring atomic weight by Dalton,Berzelius and Cannizzaro,etc,to illustrate the reasonableness,necessity of“the rule of the simplest”and its importance to measure atomic weight.
5.The fourth part is takes the land market investigation of the Hubei Province Xiantao as an example from 2001 to 2004, has studied the land price index and its the establishing method. Through measuring the each kind of soil-rent value index in Xiantao host city, revealed Xiantao in recent years the land price change rule, analysised the reason of soil-rent value changing, and provided the reference for land price forecast of future.

