316 Mr. A. J. Wilmott. Ex2:)erimental Researches on 



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FIGURES 4-10. '° 

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HOURS 1^34-5 



"Fig. 4. — Elodea : Light intensity = 6* ; temperature 16° C. A, in 1 per cent. COj 

 solutiont ; B, HCl added to 0-0005 N ; C, further HCl to 0'0015 N. 



[In this and all other figures the broken line indicates the course of the bubble- 

 rate that is to be assumed where there are no countings given.] 



Fig. 5. — Elodea : Light intensity = 7*6 ; temperature 15° C. A, B and C, as in fig. 4. 



Fig. 6. — Elodea from chalky stream : Light = 6 ; temperature 17*5°-18° C. A, 

 3-33 per cent. COj solution ; B, HCl to 0-0005 N ; C, solution stirred but not 



■* Light intensity at 10 cm. from centre of burners is called arbitrarily = 10 ; other 

 intensities were obtained after calculating by inverse square law the distance neces.sary 

 to give the required value, the light being then set by means of a metre scale fixed 

 alongside the apparatus. Values are thus only roughly approximate. 



t All the strengths of CO2 solution are expressed as volumes CO2 at 0° C. and 

 760 mm. Hg contained in 100 volumes of solution. 



