18 



METRIC MEASUREMENTS AND THEIR 

 ENGLISH EQUIVALENTS. 



The metric system adopted in this Bulletin is now 

 quite generally employed in botanical and other scien- 

 tific publications. For those unfamiliar with this sys- 

 tem the following expression of equivalents may be 

 useful : 



1 millimetre (1 mm.)=oue twenty-fifth of au inch — exactly 

 0.0394 inche. 



1 centimetre (1 cm. ) = nearly one-half of an inch ; 10 cm. = about 

 4 inches. 



1 de"cinii'tre (1 dm. ) = about 4 inches, or 3 dm. = one foot. 



1 metre (1 in. ) = about 3 feet 3| inches — exactly 39.37079 inches. 



