THE SOURCES OF THE NITROGEN OF VEGETATION, ETC. S61 
May 22.—A pipette-ful of the sulphuric-acid solution added. 
May 29.—Five plants 4 to 5 inches high, with three or four leaves each ; lowan ones 
yellow and dried up; upper pale yellowish green. A sixth plant, smaller, A or 
of the phosphate-solution added. 
June 7.—A pipette-ful of the phosphate-solution, and a pivette-ful of the sulphuric- 
acid solution added. 
. June 19.—One plant dead; two about 4 inches high with shoots at the base; other 
two about 8 inches high. 
_ June 26.—Plant (a) dead ; cause not obvious. Plant (6) 10 inches highs as Jast year, 
forming stem well. Plant (¢c) 8 inches high. Plant (d) a main stem ‘which is dead, 
-and a new shoot which is green (each 3 to 4 inches high). Plant (e)a-good. deal like(d). 
; July 3.—A pipette-ful of the phosphate-solution, and a pipette-ful of the ene 
acid solution added. 
July 14.—Plant (6) 9 to 10 inches high; six dried up, and two. green leaves ; swelling 
‘apparently for heading. Plant (c) about 7 inches high; seven dried up and two green 
leaves. Plant (d) two stems 4 to 6 inches high; six dried up and two green leaves. 
Plant (e) two stems 4 to.6 inches high, with five dead and two green leaves. 
The upper leaves quite short (1-1 irich long), and apparently live at the ene 
‘of the lower. 
July 29.—Plant (a) dead; .six leaves, becoming brown-yellow; a black mildew has 
‘attacked the leaves and stem; and a white gossamer-like fungus has attached itself in 
places to the stem and leaves. Leaves 34 to 4 inches long; the upper thread-like and 
drooping. Plant (4) the most-flourishing; 14 inches high; but very spindly; six nodes, 
which, with portions of the adjoining culm, especially the upper part, are dark purplish ; 
eight leayes; lower ones yellow, and the lowest two, which are in contact with plant 
(a), affected with the mildew; all but the uppermost leaf 2 to 24 inches long; the upper 
one 14 inch long, pale green, and quite erect, apparently the last effort of the plant, no 
new leaves forming. Plant (ce), divided just beneath the soil into three shoots; two 
apparently suckers from the other, each 3 inches high, and dead. The main plant 
6 inches high; has seven leaves; the four lower dead, and the three upper, making up 
half the plant, pale green; the uppermost only }an inch long, in the fold of the second. 
Only one node visible; the culm, where seen, is purplish. The white fungus occurs, but 
no mildew. Plant (d) much like the main plant (c); evidence of early effort to put out 
shoots at the base. Twelve leaves; ten lower ones dead; two upper ones living; all 
2 to 21 inches long. Plant (¢) the second in size. Eleven inches high; ten leaves; 
eight lower ones dead, two upper ones living; all erect but the lowest two; each 2 to 
3 inches long. 
August 18.—Plants taken up :— ; 
- Evidently done growing ; four stems swelled for head; all leaves except the uppermost 
dried up. Roots not much distributed; general. characters much. like those of barley 
without nitrogenous manure last.year (1867). . Soil moist, aie and open. . 
“Preparation and analysis as described at pp. 5438, 544. 
462 
