YENANGYOUNG. 



6 9 



The above figures prove distinctly, as will be more readily seen 

 from the diagram fig. 2, that there is unquestionably a periodicity 

 of production, which is intimately connected with the season. The 



1? 





i 



1 



1 



1 





l 



a 



— zs 

 







1 









860000 













/ 















660000 



650000 















\ 













650000 



B4O0 10 















V 



\ 











64000O 



630000 

















\ 





y 







650000 



820000 

















\ 





/ 







620000 



610000 

















\ 



/ 









610000 



600000 











/ 

















SOOOOO 



590000 



























590000 



530000 









/ 

















\ 



5B0000 



570000 









/ 

















\ 



570000 



560000 







\ 



/ 

















\ 



560000 



550000 



\ 



/ 



\ 



/ 



















550000 



540000 



\ 



/ 



\ 



/ 



















540000 



550000 





/ 



V 



1 



















530000 



520000 



\ 



/ 























520000 



510000 



























510000 































Fig. 2. Diagram showing the mean monthly yield of petroleum from 1S86 to 1894. 



year begins with a comparatively low production in January, which 

 is followed by a quick drop in February, and a sudden rise in March, 

 after another drop in April, the production quickly rises till it has 

 reached its maximum in July, a rather sudden, but not large, drop 

 takes place up to September, when it again slowly rises till November, 

 only to fall largely and suddenly in December, a drop which lasts till 

 February. Now, is it a mere coincidence that the curve, as above 

 depicted, represents in some rough way the line illustrating the rise 

 and the fall of the Irawadi ? Unfortunately no exact observations 

 regarding the river gauge have been made at Yenangyoung, but 

 experience has proved that the river reaches its lowest level in 

 February, a small rise takes place in March, probably owing to the 

 snow water coming down from the upper regions of the catchment 

 area, and then another fall takes place in April. From May the river 

 rises until it has reached its maximum level during the months of June, 

 July or August; it falls slowly till November, but thence to February 

 the fall is quick and considerable. 



