160 Gardner—Studies on Growth and Cell 
shown, and in every case the result was the same. Besides 
these experiments with the bean, more than fifty 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 of growth per hour. Rate of growth per hour. 
Day. Night. Day. Night. 
1 1 10 
2 I a3 
2 Ss 17, G 24 «6 +7 66 
2 CG oe a ‘ec net ‘<< 
: 17 3rr 135i 
11 : ey 1 ‘“ 12 66 
x ‘hg I; 17 
rit «6 i, “ ribs, Ge 1 ces 
ao 166 10 « 4 2 
237 17 11 “6 Te) ues 
ees UG Sse ; ‘“ ie “ 
27 34 11 18 
‘ce 13 ce 
% bo 4 2 ““c ale 
Deaunics 88 66 Pe TT te 
1s 34 2 a 
2 a3 iui “ce 
I7 
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 70 per cent of the 
1 Bot. Cent. 1896, Vol. 67, p. I. 
