Ill 



' perceived. Dr. Hales has shewn, that 



* in the summer months a sun-flower, 



* weighing three pounds avoirdupois, 

 ' and watered regularly every day, passed 



* through it, or perspired, twenty-two 

 ' ounces each day ; that is nearly half 

 ' its weight. He also found that a cab- 

 ' bage-plant, weighing one pound nine 

 ' ounces, sometimes perspired one pound 



* three ounces ; but at a medium about 

 ' half its weight. Doctor Woodward 

 ' found that a sprig of spearmint, weigh- 

 ' ing only twenty-eight ounces twenty- 

 ' five grains, passed through it 3004 

 ' grains in seventy-seven days, between 



* July and October ; that is, somewhat 

 ' more than its own weight each day. 

 *' He did more ; for he found that in that 

 ' space of time the plant increased seven- 



* teen grains in weight, and yet had no 

 ' other food but pure rain-water : but 

 ' he also found that it increased more in 



p 2 *' weight. 



