SCIENCE AND INDUSTRY. 
160,000,000; in 56 years, 320,000,000; in 70 years, 640,000,000; in 
S4 years, 1,280,000000; and in less than a century, 2,560,000,000 acres, 
emit anhalt 
Photo., Dept. Agriculture, Brisbane. 
_ “THERE STANDS IN THE FOREFRONT THE PRICKLY PEAR MENACE.” 
The notorious “Jointed Cactus” of South Africa, as grown at Roma, in Queensland. 
or more than the whole area of the Commonwealth. By that time the 
annual increase would have reached over 125,000,000 acres. These 
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