432 Baker. — Quantitative Experiments on 
were gone. Then they were heated to 8o°-ioo°, cooled in a calcium 
chloride desiccator, and weighed. A blackening over the surface was still 
produced, but this may have been rather an oxydase action than due to 
true charring. 
Expt. 1. 
Expt. 2. 
Expt. 3. 
Expt. 4. 
Expt. 5. 
Expt. 6.. 
grm. 
grm. 
grm. 
grm. 
grm. 
grm. 
Original weight 
0 - 47^5 
0-3917 
0-4767 
0-4084 
0-3998 
0-4259 
Original dry weight 
0-4540 
0-3772 
0-4590 
0-3826 
0-3745 
0-3989 
Final dry weight 
0-4801 
0-3968 
0*4853 
0-4062 
o -3954 
0.4234 
Gain in dry weight 
0-0261 
0-0196 
0-0263 
0-0236 
0-0209 
0-0245 
% gain due to hyd. 
5*75 % 
5 - 2 i % 
5-73 % 
5-78 % 
5-23 % 
5 * 75 . % 
Mean value for gain in hydrolysis — 5*58 % 
The mean of these results has been used in calculating the loss in dry 
weight during respiration. The total loss during respiration was taken as 
the loss in dry weight observed in the respiration experiment plus this 
value for the gain in dry weight on hydrolysis. 
Experimental Results for Respiration. 
The first two experiments were running simultaneously from 
October 7 to 21, 1912. Of the two cultures, Experiment 2 grew far the 
more luxuriantly, as the waterer of Experiment 1 was not correctly adjusted, 
and so the plants suffered through insufficient water-supply. At the end of 
the experiment the plants in Experiment 1 were only 3 cm. high and were 
of stunted and irregular growth. In Experiment 2, however, the plants 
were 10 cm. high and very healthy in appearance, but they grew out at the 
top of their ‘house 5 before it was possible to stop the experiment, and so 
reached the ‘ dead 5 space between the air inlet- and exit- tubes, and no doubt 
a certain amount of the water of transpiration was lost on the sides of the 
desiccator, and perhaps also some of the carbon dioxide was c dead-locked 5 
between the air-tubes. 
The third experiment was running from October 24 to November 4, 
1912. The plants were well grown, about 3 cm. high; the same waterer 
was used as for Experiment 2. 
The wet weighings in all these experiments were done by the method 
of ‘ timed 5 weighings. The balance used was by Becker, London, but only 
sensitive to 0*0005 grm. 
