THE SAN JOSE SCALE. 



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kong, the Malay Peninsula and Java, indicated that the San Jose scale 

 in eastern Asia can not survive below Shanghai. 



The special district where it is native and thrives is a fairly well 

 slml oil' region, which probably accounts for the failure of this insect 

 to become a world pest ages ago. This district is the region leading 

 up to the mountains and comprising the northern and northeastern 

 frontiers of China proper. Beyond the great wall on the north and 

 west lies Mongolia, consisting chiefly of the vast Desert of Gobi. To 

 the northeast and separating the region from Manchuria and Corea is 



Portion of Street devoted to Sale of Fruits in Pekin, China. 



[la foreground, fruit samples; in background, storehouses, also dromedaries employed to 

 bring products from remote provinces.] 



the eastern Gobi desert. To the south and east lies the great alluvial 

 plain, the product of centuries of mud carried down by the Yellow 

 Kiver, a region where cereals only are grown. These are all effective 

 barriers, and especially so when considered in connection with the po- 

 litical conditions of the past. We have, therefore, as the original 

 home of this insect a naturally shut-off area from which it could not 

 easily escape under the conditions prevailing up to our own times. 



The means by which the San Jose scale came from China to Amer- 

 ica is a matter of interest. This pest reached California on trees 

 imported by the late James Lick, a gentleman who was an enthusiastic 



