VIU 



XXV. 



XXVI. 



XXVII. 



XXVIII. 



XXIX. 



XXX. 



XXXI. 



XXXII. 



XXXIII. 



XXXIV. 



XXXV. 



XXXVI. 



XXXVII. 



XXXVIII. 



XXXIX. 



XL. 



XLI. 



XLII. 



CONTENTS 



Reserve sugar in onion bulb 



Proteids in onion bulb 



Cause of nocturnal position of leaves .... 

 Values of illumination for leaf positions 

 Adaptation of growing leaves to changed light relations 

 Heliotropic movements of English ivy 



Pagb 

 . 48 

 . 48 

 . 53 

 . 53 

 . 54 

 . 55 



Oxygen making by plants 57 



Starch in Tropceolum leaves 57 



Consumption of starch in Tropmolum leaves . . .58 

 Effect of sealing stomata on starch production . . .59 

 Effect of darkness on chlorophyll production . ^ . .69 



Transpiration 60 



Side of Ficus elastica leaf which transpires . . .61 



Relative transpiration of Hydrangea Hortensia and Ficus 



elastica 61 



Passage of water from stem to leaf 63 



Rise of water in leaves 63 



Starch contents of leaves at various seasons . . .63 

 Production of pollen tubes 68 



