VEGETABLES 439 



least inconvenience. So oaks may be barked while the 

 leaf is budding; but as soon as they are expanded, the 

 bark will no longer part from the wood, because the sap 

 that lubricates the bark and makes it part, is evaporated off 

 through the leaves. 



RENOVATION OF LEAVES 



When oaks are quite stripped of their leaves by chaffers, 

 they are clothed again soon after Midsummer with a beauti- 

 ful foliage : but beeches, horse-chestnuts and maples, once 

 defaced by those insects, never recover their beauty again 

 for the whole season. 



ASH TREES 



Many ash trees bear loads of keys every year, others 

 never seem to bear any at all. The prolific ones are naked 

 of leaves and unsighdy ; those that are sterile abound in 

 foliage, and carry their verdure a long while, and are 

 pleasing objects. 



SYCAMORE 



May 12. The sycamore or great maple is in bloom, 

 and at this season makes a beautifiil appearance, and affords 

 much pabulum for bees, smelling strongly like honey. The 

 foliage of this tree is very fine, and very ornamental to out- 

 lets. All the maples have saccharine juices. 



GALLS OF LOMBARDY POPLAR 



The stalks and ribs of the leaves of the Lombardy 

 poplar are embossed with large tumours of an oblong 

 shape, which by incurious observers have been taken for 

 the fruit of the tree. These galls are full of small insects, 

 some of which are winged, and some not. The parent 



