at different periods of the Day. 



255 



Table shewing the amount of growth of all the foregoing plants 

 during the months of both July and August. 



The examination of these tables shews that the same discrepan- 

 cies as were remarked on the former occasion, when the plants 

 under observation were growing in a hothouse, occur when the 

 plants are exposed to the open air ; and prove conclusively that 

 those discrepancies were not owing to the artificial state in which 

 the experimental specimens were placed. 



The period of the day at which the greatest growth takes place 

 still proves to be the afternoon, if all the experiments are regarded 

 as but one; for the numbers stand thus: night 119.07, morning 

 156.26, afternoon 180.90 ; but when the experiments are separated 

 it then appears that the period of maximum growth varies with 

 the species ; in the Hop, Sweet Willow and the Gourd it was the 

 afternoon ; in the Fig and Jerusalem Artichoke it was the morning ; 

 in the Vine it was the night in July and the morning in August ; 

 in the Scarlet Runner the morning in July and the afternoon in 

 August. It is especially worthy of observation that this does not 

 correspond with the observations of 1843, for at that time the 

 Willow, which in 1844 grew upon the whole fastest in the after- 



