Carbon Assimilation. 19! 
Table XXVI. 
Assimilatory Coefficient for Succulents (Aubevt). 
Species. 
Date 
Temperature. 
Assimilatory 
Coefficients. 
Aloe spinosa ... 
23 July 
24°C 
2-45 
Crassula arborescens 
2 „ 
32°C 
3-57 
Mammilaria Newmanniana ... 
* » 
f 1 
3-51 
Opuntia tomentosa ... 
J * 
» > 
4-68 
M ,, ••• 
23 „ 
24°C 
7-59 
Sedum carneum . 
O 
** J1 
32°C 
1*55 
,, reflexum 
» > 
1*40 
,, Telephium . 
» » 
y y 
1-24 
n >1 ••• ••• 
23 „ 
24 °C 
1*34 
Recently Maquenne and Demoussy (1913) have called in question 
Bonnier and Mangin's results. As with all other workers on this 
subject, these investigators used a closed vessel as plant chamber 
connected to a reservoir containing 8 or 10 parts of carbon dioxide 
to 100 of air, from which the leaf chamber was filled after 
evacuation. 
The leaf chamber was exposed to light and after a convenient 
• time the gas in the chamber was analysed. 
The respiratory and assimilatory coefficients of a large number 
of species were measured; the results are given in the following 
table. 
Table XXVII. 
Respiratory and Assimilatory Coefficients (Maquenne &= Demoussy). 
Species. 
Respiratory 
Coefficient. 
Apparent 
Assimilatory 
Coefficient. 
Ailanthus 
1-08 
1-02 
Aspidistra 
0-97 
100 
Aucuba 
Ml 
M0 
Begonia . 
Ml 
103 
Cherry Laurel . 
1-03 
0-97 
Chrysanthemum ... . 
102 
101 
Dahlia... 
1*07 
107 
Haricot ... . 
Ml 
M2 
107 
1-07 
Ivy ... ... ... . 
1-08 
1-00 
Lilac. 
107 
103 
Lily 
107 
100 
Mahonia (autumn). 
0-95 
099 
