36 CELERY. 



to fairly estimate the number of celery 

 plants thus lost every year, but it must 

 be set down at many millions. Since 

 using my plan I find that my plants make 

 as much growth in one day as I formerly 

 could get in six, and the risk is almost 

 nothing. Why the moisture thus con- 

 denses may be easily explained, and a 

 single illustration will suffice to make my 

 meaning plain. If we pour ice-water into 

 a tumbler, in a room the temperature of 

 which is 70 deg. Fahr., beads of moisture 

 will at once collect on the outside of the 

 glass. This moisture has of course not 

 oozed through the glass, but been forced 

 to separate from the layers of atmosphere 

 which touch the cold glass. It being a 

 fact that the air can hold more water in 

 a state of vapor as its own temperature 



