COMPOSITION IN SUCCESSIVE STAGES. 217 
The gain during each period was accordingly as fol- 
lows: 
Fiber. Fat. Amyisds. Albuminoids. Ash. 
I. Period. 18°|, 20°|, 15°|, 279], 299 |, 
1 63 “* 30)*S 32 ‘ ike; 26 “ 
1 1 a age ate 35‘ Opies 12,6 24 “ 
IV. ‘ (a 15“ 99 & 83 16 “* 
V oe 0 «c 0% 8 v6 10 9 5 sé 
100 ** 100 ‘‘ 100 ‘* 100 “ 100 ‘* 
6.—As regards the individual ingredients of the ash, 
the plant contained at the end of each period the follow- 
ing amounts,—-the total quantity in the ripe plant being 
taken at 100. Corresponding results from Bretschneider 
enclosed in ( ) are given for comparison. 
Phos 
Silica. supine beri Lime. Magnesia. Potash. 
Per cent. Percent. Percent. Percent. Percent. Percent, 
4 Period, ¥ ( 22) a0 ( 42) “e ( 23) o ( 31) ts ( 81) a ( 42) 
me «© © mes) Bhan Abc 63) ah 88) Eh C TD) gi fC 80) 
IV. ss 93 ( 72) 90 ( 39) 91 ( 74) 99 ( 74) 84 ( 77) 100 (100) 
Bye ga 100 (100) 100 (100) 100 (100) 100 (100) 100 (100) 100 (95*) 
The gain (or loss, indicated by the minus sign —) in 
these ash-ingredients during each period is given below. 
Silica, SU idl Pi sa ai Lime. Magnesia. Potash. 
Percent. Percent. Per cent. Percent, Percent. Per cent. 
x Period, 18 ( 22) 20 ( 42 ) a ( 23) 30. € 81.)\ 24..¢ 81) 89 ( 42) 
os Bio Shem Ram Bee pla Ben 
ve |S 23 ( 15) 88 (—5*) 18 (10) 20 (—9*) 26 (4) 9 (11) 
a 7 ( 28) 10 ( 56 ) 9 (2%) £ SC1G) 16 ( 28) 0 (—5*) 
100 (100) 100 (100) 100 (100) 100 (100) 100 (100) 100 (100) 
These two independent investigations could hardly give 
all the discordant results observed on comparing the above 
figures, as the simple consequence of the unlike mode of 
conducting them. We observe, for example, that in the 
last period Arendt’s plants gathered less silica than in any 
other—only 7°|, of the whole. On the other hand, Bret- 
0 
schneider’s crop gained more silica in this than in any 
* Intheseinstances Bretschneider’s later crops contained less sulphuric acid, lime, 
and potash, than the earlier. This result may be due to the washing of the crop ty 
rzing, but is probably caused by unequal development of the several plots. 
10 
