206 TKAXSA.CTIOXS AND PEOCEEDINGS OF THE [Sess. lviii. 



In these experiments on different kinds of barley, the 

 large majority of the olDservations, during germination, as 

 to the amount of oxygen utilised by the corns, points to a 

 small but variable increased activity under the influence of 

 strong diffused light. Of the sixty-six observations re- 

 corded on this point, fifty-six are in favour of light, eight 

 in favour of obscurity, and two show an equality. 



Of the total quantity of oxygen utilised in each experi- 

 ment, the results show a small variable increase in favour 

 of light in every case : — 



The total excess of oxygen utilised, in favour of light, 

 in all the experiments amounts to 11 '5 2 c.c, or an increase 

 of 4'73 per cent, on the mean of the total quantity of 

 oxygen utilised, 243-71 c.c. 



Of the ten experiments in which the carbonic anhydride 

 produced was determined, all show a small variable increase 

 in favour of the corns grown under the influence of light. 



Experiment. 



8. 

 10. 



IL 



Carbonic Anhydride produced. Excess in favour of 



Totals 



The total excess of carbonic anhydride produced, in 

 favour of light, in all the experiments is 9 '40 c.c, or an 

 increase of 4'03 per cent, on the mean of the total quantity 

 of carbonic anhydride produced, i.e. 233'31 c.c 



