28 



THE SYNTHESIS OF CARBOHYDRATES 



gaseous diffusion. The values he obtained show that tem- 

 perature has no effect on the rate of photosynthesis when the 

 illumination is very low ; with higher light intensities, the 



-238 



157 



d'02 

 u 



^70 

 in 



2 38 



E 

 < 



2- 



-149 



-102 



-10° 0° 

 Temp: 



■10' 20° 30° 40° 



Fig. 5. 



coefficient decreases with increasing temperature. Thus with 

 a relative light intensity of 45, between 5'4°-lO° f Q 10 = 4-5 ; 

 between io°-20°, Q 10 = 2-1 ; and between 20 - 30 , 



