190 Ingvar Jorgensen and Walter Stiles. 
assimilatory coefficient. Thus Bonnier and Mangin explain the fact 
that Boussingault obtained a ratio of -^JLof about unity. 
Table XXV. 
Assimilatory Coefficients for Differetit Leaves (Bonnier and Mangiti). 
Species. 
Month. 
Real 
Assimilatory 
Coefficient 
o, 
CO, 
Respiratory 
Coefficient 
CO, 
o 2 
Apparent 
Assimilatory 
Coefficient. 
Tobacco ... 
November 
M2 
0-73 
1-00 
Ivy 
99 
1-09 
0-86 
1-00 
n •• • 
99 
1-08 
0-80 
101 
Bramble. 
99 
1-06 
0-84 
0-91 
Ivy 
December 
1-06 
0-84 
0-88 
Butcher’s Broom 
9 9 
1-08 
0-78 
0-92 
Broom 
March 
1*16 
0-87 
1-09 
Pinus sylvestris 
1 » 
117 
0-80 
088 
99 91 
J* 
M2 
0-85 
1-04 
Chestnut... 
June 
1-06 
0-83 
0-99 
Lilac . 
9 * 
106 
0-96 
1-05 
99 ••• ••• 
♦ » 
1-05 
0-93 
1-02 
Holly . 
February 
1-24 
0-75 
1-13 
Chestnut ... 
April 
1.16 
082 
0-91 
Broom 
February 
1*16 
0-85 
0-92 
In an extended series of observations on the respiration and 
assimilation of succulents, Aubert (1892) has obtained similar 
values for the assimilatory coefficient of ordinary plants, but much 
larger values for succulents. He concludes that the 
_2i 
CO. 
exchange 
due to assimilation is greater than unity for all plants. For ordinary 
plants the ratio is not very far removed from unity, but for succulents 
it may be much larger. For ordinary plants the ratio varied from 
F05 to F23, numbers which agree closely with Bonnier and Mangin’s 
observations. Some of the values obtained by him for succulents 
are given in the accompanying table. The values quoted for Sedutn 
Telephium and Opuntia tomentosa show that at different times the 
ratio for the same plant may vary greatly. 
Having regard to the peculiar metabolism of succulents, 
however, the relation of these assimilatory coefficients to the 
assimilatory process is doubtful. 
