1087 
ttpon Respiration and Assimilation . 
Experiment X. Concentration of Chloroform = 0-22 c.c. per litre of 
air-cnrrent. Barley leaves were again used, the chloroform being started 
immediately after the first normal respiration reading. The output of C 0 2 
then rose from 0-0024 to 0-0049 grm. in the second reading. This outburst 
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Time 
Fig. 12. 
was followed during the next few hours by a rapid fall, so that it only 
lasted a brief time (Fig. 12). This in itself is an approach towards the 
later types. The rapid fall is followed by a well-marked recovery, so that 
in its later stage it recalls C and in its earlier D; we may therefore regard 
it as C-D. 
Experiment XI. Concentration of Chloroform = 1*5 c.c. per litre of 
air-current . Barley shoots were used for this experiment, and as it was 
found impossible to charge the air-current with so much chloroform by 
means of the c anchor tube \ the bulb apparatus (p. 1085) was employed 
under such conditions that about 1.5 c.c. chloroform was vaporized per hour. 
One reading of the normal respiration was taken and then the bulb-tube 
of chloroform was put in the circuit. 
This concentration of chloroform caused an outburst of C 0 2 in the 
second reading, the output rising from 0-0019 t° 0-0029 grm. After this 
4 B 2 
