THE SOURCES OF THE NITROGEN OF VEGETATION, ETC. 563 
June 19.—One plant dead; another looking unhealthy; the third 4 to 5 inches high, 
with five leaves, growing pretty well. 
June 26.—Two plants dead; the other growing, 7 to 8 inches high, with nine leaves, 
each with two stipules. 
July 3—A pipette-ful of the phosphate-solution, and a pipette-ful of the sulphuric- 
acid solution added. 
July 14.—The third or only surviving plant has ten leaves, but looks unhealthy. 
July 29.—The two dead plants fallen, moulded, and dried up. The other blackened 
and mouldy at the base of the stem, and thence to the top yellow; three top leaves 
partly yellow, but the remainder black. 
August 17.—All three entirely dead. Pot removed, but products not analysed, as 
there had not been sufficient healthy growth. It is difficult to account for this failure; 
but it is possibly due to the very hot weather. 
No. 5.—Beans (1858); three seeds; prepared soil; without (but intended to have) 
nitrogenous manure. 
June 11.—Seeds set in prepared soil, with ash that had been neutralized with sul- 
phuric acid, and gently re-ignited ; and the pot placed over sulphuric acid and covered 
with a glass shade. 
June 21.—The pot removed to its place on the stand. 
June 26.—Three plants up; green and healthy; four leaves, each with two leaflets, 
and two stipules. Plants delicate, but healthy green colour; one shows air-roots. 
July 3.—A pipette-ful of the’phosphate-solution, and a pipette-ful of the sulphuric- 
acid solution added. 
July 14.—Three plants, healthy and vigorous; 8 to 12 inches high; eight leaves on 
each; a few black specks on some of the leaves, otherwise healthy. The weather has 
been comparatively cool since planting till now; but now hotter with bright sun. <A 
few air-roots at the base of the stems. 
July 29.—Three plants; 8, 83, and 12 inches high. Plant (a) lost all its leaves, except 
rudimentary ones at the top. A shoot 2 inches long with four small leaves about an 
inch from the base, more growing than the parent plant; another shoot appearing about 
an inch above. Plant (4) very unhealthy; lost all leaves but six small and partly black 
ones at the top; a vigorous shoot 5 inches long, springing an inch from the base, seems 
to exhaust its strength; another small shoot 1 inch long, about 2 inches higher up. 
Plant (c), most of the leaves dropped ; but several of the petioles remain, and are green ; 
some small withering leaves at the top; two shoots starting near the base. 
August 17.—Three plants; the main stem of each lost nearly all the leaves. Each 
plant has living shoots with several leaves each near the base. 2 
August 23.—Plants taken up :— 
There has been scarcely perceptible growth for two or three weeks; leaves nearly all 
off. Soil moist. Roots extend only a little way, and consist of a thick mat around the 
