490 



DISEASES OF ECONOMIC PLANTS 



16,000,000 in 6 or 8 hours under the most favorable conditions) 

 that notwithstanding their minuteness they are formidable foes. 

 They are, of course, invisible to the naked eye except in masses 

 of countless numbers. 



Fig. 214. — Bacillus subtilis. Swarming rods with numerous fine flageila. X, after 

 7i hrs.; B, after 8J hrs., with fully developed flageila. (After A. Tischer.) 



English Equivalents of Metric Units 



1 mm. 0.0394 inch, or approximately ^^ inch 

 1 cm. 0.3937 inch, or approximately f inch 

 1 dm, 3.9370 inches, or approximately 4 inches 

 1 m. 39.37 inches, or approximately 1 yard 



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