227 
following experiments. A young bean plant, grow- 
ing in a garden pot to the height of six inches, was 
inclosed by the tin apparatus, in the manner already 
described (226.) ; and by the side of the plant was 
placed an egg cup, which contained two drachms of 
freshly pounded lime. Over the plant and cup, a 
glass jar, containing about 38 cubic inches of atmos- 
pheric air, was then inverted, and the mouth of the 
jar was surrounded by lime-water ; the temperature 
of the room was 6 1 , and the apparatus was set aside 
in a part of the room that received the full light of 
day, but was not exposed to the direct rays of the 
sun. During the first day, the jar continued perfect- 
ly dry, the plant was rather diminished in height, and 
the lime had considerably increased in bulk. By the 
end of the second day, the appearances were nearly the 
same, but the lime was now much more bulky ; and 
the water had risen into the jar to the height nearly 
of half an inch. Through the two succeeding days, 
the lime continued to swell, the water to rise, and the 
jar remained dry ; but the plant, though looking 
fresh and green, exhibited no sign of growth. At the 
end of the fifth day, the leaves became pale, and had 
a withered appearance, and the stem began to turn 
black. By the close of the following day, the lime 
was so much swollen as nearly to fill the egg cup ; 
the stem of the plant was more black ; the leaves 
were much paler and more withered, and had fallen 
two inches below the thread, which was at first tied 
round the jar to mark their greatest height ; and, 
notwithstanding the water had, by this time, risen 
nearly an inch, the jar still continued quite dry. 
P2 
