COMPOSITION IN SUCCESSIVE STAGES. 217 
The gain during each period was accordingly as fol- 
lows: 
Fiber. Fat. Amyloids. Albuminoids. Ash. 
I. Period, 18°, 20° fo 15°|, 274 29°, 
i, 63 “* 80 32 + 18 “ 26 “* 
Til, “ 19 ae 85 fi 293 “ce 12 a“ p2i a“ 
Iv. ii3 0 ae 15 c 22 “we 33 cc3 16 “a 
Vv. “ 0 iT9 0 ce 8 “ce 10 oe 5 a 
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. 
Silica. Bulphurte Thophorte Lime. Magnesia. Potash. 
Percent. Percent. Percent. Percent. Percent. Percent. 
if Period, 18 (22) 20. (42) 23. (28) 80. (31) A (BL) 89. 42) 
Hos Hon Bic Bho Bice) Bim Bican 
Iv. « 93°('72) 90° (89) 91 (74) 99 (74) 84 (TD 100 (100) 
V. © 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, Sulphuric Phowhoric rime, Magnesia. Potash. 
. Percent. Percent. Percent, Percent. Percent. Percent. 
a Period, 18 ( 22) 20 (42) 23° (23) 30 (381) 24 ¢ 31) 39 (42) 
tr Beh 3 BRC my Bhan) Bbc may BRC ay BRC a7) 
iv. § 23 (15) —5*) 18 (10) 20 (—9*) 26 (4) 9 (11) 
Vie. 7 (8) 10 (56) 9 (27) 1 (17) 16 ( 28) 0 cua 3 
100 (100) 100 00) +100 (100) 100 (400) 100 (100) 100100) 
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 siZica than in any 
other—only 7°|, of the whole. On the other hand, Bret- 
schneider’s erop gained more silica in this than in any 
* In these instances 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 by 
rains, but is probably caused by unequal development of the several plots. 
10 
