Weather Signs, and Protection from Frost. 157 



45° and 65° P., multiply the difference between the wet-bulb and 

 dry-bulb thermometers by two and subtract the product from 

 temperature of dry-bulb. If the remainder is above 42° F., there 

 is little danger of frost. The nearer this remainder comes to 32°, 

 the greater the danger of frost, especially if the air is still and 

 clouds disappear at sunset. 

 To Protect Plants from Light Frosts: 



1. Make a smudge in the garden or vineyard at night when the 

 frost is expected. Rubbish or litter and tar make the best 

 smudge. 



2. Syringe the plants thoroughly at night-fall. 



-^ 



Learn we of the -winds, and the weather's changeful face. 

 And what the ancestral haunts and habits he 

 Of things that grow : — the loved of every place, 

 And the rejected. 



-Vergil. 



