XIV 



ABBREVIATIONS AND SIGNS. 



n. SIGNS USED IN THIS WORK. 



® An annual plant. 

 @ A biennial plant. 

 IJ. A perennial plant. 

 ? A mark of doubt. 



! A mark of affirmation or authentication. 

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

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

 twelfth part of an inch. 

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



