280 University Geological Survey of Kansas. 
Most franchises to gas companies do not say anything about 
the heat values of the gas. So long as “‘natural gas” is fur- 
nished, the stated sum may be charged per thousand cubic feet. 
Now, if, as we have seen, this “natural gas” may vary widely 
in composition and in heat value and therefore vary in its 
value to the user, it would seem better that the gas should be 
sold on the basis of the heat value as determined by actual 
calorimetric measurement. 
It is just as important that calorimetric control be made on 
the gas furnished to a community as that chemical control be 
made of the water supply furnished to the community. We 
would suggest, therefore, the advisability of such control under 
some regularly constituted authority of the state in the same 
manner as the control of water and food supplies by the State 
Board of Health. Careful attention paid to this matter would 
doubtless save to the gas-consumers of the state an amount of 
money vastly in excess of its cost. 
SECTION IV. 
GENERAL DISCUSSION. 
1. Searcity of reliable gas analyses. 
a. Insufficient survey of gas-producing areas. 
b. Sources of error in analyses. 
ce. Variation in gas from different parts of same field. 
2. Variation in composition of gas from same source. 
a. Evidence. Phillip’s work. 
b. Possible explanation of variation. 
ec. Desirability of further investigation. 
3. The uses of natural gas. 
a. As fuel. 
b. In chemical manufacture. 
Hydrocarbon gases. 
Nitrogenous gases. Calcium cyanamid, etc. 
Gases high in helium, etc. 
c. Need for intelligent investigation of new uses. 
General Discussion. 
In this report we have given nearly all the gas analyses 
which we have been able to find, and while there are undoubt- 
edly many which have been overlooked in our search we be- 
lieve that the most important ones are here recorded. The 
number of analyses of gases from wells which are commer- 
cially productive is surprisingly small, and many of them are 
of but little value, owing to defective methods of analysis. 
These few analyses, both good and bad, have been quoted time 
and again. A few analyses have been taken as representing 
the composition of gas over large areas. This is a somewhat 
dangerous thing to do. It is perhaps more nearly justified for 
