196 



GRAPE CULTURE AND WINE-MAKING. 



Thus the space between the freezing and boiling points of wa- 

 ter is divided by Eeaumur into 80 parts, by Celsius into 100, and 

 by Fahrenheit into 180 parts. The following table will enable 

 any one readily to convert the degrees of temperature as marked 

 by one thermometer into those of either of the others. 



" The degrees below zero in each are indicated by the sign — 

 [lyiinus). 



COMPARATIVE TABLE OF THE THERMOMETERS OF REAUMUR, 

 CELSIUS, AND FAHRENHEIT. 



77ie Areometer, or Must-Scale. 



"When a solid body is put upon a fluid, it will press it out of its 

 place ; and if it be heavier than the fluid, will sink to the bottom ; 

 but if it be lighter, it swims upon it. The swimming body itself 

 pushes, however, more or less parts of the fluid out of their place ; 

 sinks more or less deep into it. The depth of this sinking is dif- 



