XIV 



ABBREVIATIONS AND SIGNS. 



II. SIGNS USED IN THIS WORK. 



(T) An annual plant. 

 (2) A biennial plant. 

 1J. A perennial plant. 

 ? A mark of doubt. 



! A mark of affirmation or authentication. 



1, 2', 3". To save space, the sign of degrees () is used for feet; of min- 

 utes; for inches; of seconds ("); for lines, the (English) line being the 

 twelfth part of an inch. 



The dash - between two figures, as 5- 10, means from 5 to 10, &c. 



