200 THE BUTTER INDUSTRY IN UNITED STATES [424 

 Diagram VIII. — Comparison of Receipts of Butter and Cheese at Chicago 



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 in O 



C .- o>-PJ flrj- "->>o t^OOOsO —NrOTfu-ivO r-» 00 On O •- N "■*> 



gS ooooso oso\o\onono 00000 o o 00 ►-*-- ~ 



O 00 00 00 00 00 000O0O0O0O 0\ChO\ONONO\0%0\CT><^ONChONO> 



i— 1 — _ — — — — — » n — _,_»._ -,— ___»«__„„ 



Receipts of butter at Chicago. 



o Receipts of cheese at Chicago. 



Drawn according to data from Reports of the Chicago Board of Trade. 

 Figures for cheese for the years 1912 and 1013 not available. 



and these figures do not seem to indicate that important 

 changes in yearly amounts of dairy products are due to 

 changes in the number of milch cows. An intensive study 

 as to causes of the yearly changes in the amounts of dairy 

 products, besides taking into account the number of milch 

 cows in a given area, would also have to consider changes 

 in the yield or flow of milk, because the cow is capable of 

 showing an increase or decrease in the flow of milk accord- 



