l6o 



Gardnc}- — Studies on Grozvth and Cell 



shown, and in every case the result was the same. Besides 

 these experiments with the bean, more than fiftj' others were 

 performed with the pea, and records of these were similarly 

 made. The results here confirm those of the bean. In many 

 cases they are even more striking. The following table gives 

 the rate of growth per hour during day and night of twenty 

 peas: 



Rate oJ growth per hour. 



Rate of groirth per hour. 



The results, which the writer obtained, are in direct oppo- 

 sition to those obtained by Sachs. Sachs believed that 

 growth was greater during night than during day. He says 

 that although the increased temperature of the day would 

 induce an increase in the growth by day, yet daylight works 

 in the opposite way. In all his experiments and diagrams, he 

 shows an increase of growth during night and a progressive 

 •diminution during day. 



Another writer, Walter Maxwell, in a paper entitled "The 

 Rate and Mode of Growth of the Banana Leaf,"' has worked 

 on the same question. His experiments, though conducted 

 on a different organ of the plant, agree fundamentally with 

 those given in the present paper. He says : " In comparing 

 the growth of leaves by day and night yo per cent of the 



1 Bot. Cent. 1S96, Vol. 67, p. i. 



