124 



SWEET OIL. MANNA. 



duced. The oil is afterwards skimmed off the water, and put in 

 tubs, barrels, and bottles for use. Pickled olives are prepared from 

 unripe fruit, by repeatedly steeping them in water, to which quick- 

 lime or any alkaline substance is sometimes added to shorten the 

 operation. Afterwards they are soaked in pure water, and then 

 taken out and bottled in salt and water, with or without an aro- 

 matic. Spanish olives differ from the rVench in consequence of 

 being prepared from ripe fruit.) 



74. The Ash Fraxinus is among the largest and most beau- 

 tiful forest trees ; it delights in a humid, light soil ; its wood, which 

 is white, longitudinally veined ano very pliant, is much employed 

 in carriage-building, &c. 



75. The Manna-ash, or round-leaved ash Fraxinus ornus-~ 

 which grows in Calabria, and on the coast of Africa, permits a 

 sugar-like substance to exude through its bark, which hardens in 

 the air, and is known under the name of manna.. 



Fig. 150. SCARLET SAGE. Fig, 151.SAGE. 



76. FAMILY OF LABIA'TJE (Jigs. 150 and 151) belongs to 

 the same division as the preceding : these plants, which are 

 alrnos* all herbaceous, have a square stem and n tubular corolla, 

 divided into two lips, one of which is superior to the other 

 (fig. 151); the fruit is composed of four monospermous ache- 

 niums enclosed in a persistent calyx, and the leaves are sessile 

 and opposite. Most of the Labia'ta? are very aromatic ; they are 

 employed in medicine, and for the preparation of scented waters ; 

 yuch are the mint, lavender, rosemary, sage, thyme, balm, &c. 



>7 4. What use is made of the ash ? 



75. From what tree is manna obtained ? 



76. What are the general characters of the family of Labia'tce i 



