to2 Carbon Assimilation. 



Table XXVII — continued. 



Species. 



Respiratory 

 Coefficient. 



Apparent 



Assimilatory 



Coefficient. 



Maize ... 

 Oleander 

 Pea ... 

 Pear ... 

 Poppy 

 Privet ... 

 Rhubarb 

 Ricinus 

 Rose ... 

 Spindle-tree 

 Sorrel ... 

 Tobacco 

 Turnip... 

 Vine ... 

 Wheat... 

 Wild Grape 



107 

 1.05 

 1-07 

 MO 

 1-09 

 103 

 1-02 

 103 

 102 

 1 08 

 104 

 1-03 

 Ml 

 1-01 

 103 

 1-00 



105 

 1-01 

 1-04 

 1-U8 

 1-09 

 1-02 

 1.00 

 1-(I3 

 1-00 

 102 

 1-04 

 1-04 

 1-06 

 0-99 

 1-02 

 1-01 



From their results Maquenne and Demoussy conclude that the 

 value of the apparent assimilatory coefficient lies between that of 

 the respiratory coefficient and unity, especially as the leaves were 

 probably at a higher temperature during the assimilatory period 

 than in the dark, so that as the respiratory coefficient rises with 

 temperature, higher respiratory coefficients probably correspond 

 with the assimilatory coefficients given. 



They therefore conclude that the real assimilatory coefficient 

 approximates to unity. 



For if c is the volume of oxygen evolved in assimilation alonei 

 and if d is the volume of carbon dioxide absorbed, in assimilation 

 alone, 



And if a is the volume of carbon dioxide evolved in respiration, 

 and if b is the volume of oxygen absorbed in respiration during the 

 same period, 



m, the respiratory coefficient, 



c— b 



a 

 "b 



and 



:= the apparent assimilatory coefficient. 



We see that 



is between 1 and m. 



d— a 

 When, as in the general case m > 1 



then also - — ^ 1 

 d — a 



whence 1 — .-<;-- (m — 1) 

 d ^ d 



and when m •< 1 



