THE SOURCES OF THE NITEOGEN OF VEGETATION, ETC. 
663 
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; yireggared soil; without {hut 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, 8^, 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 {h) 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. 
August 23. — Plants taken up : — 
There has been scarcely perceptible growth for two or three weeks ; leaves nearly all 
off. Soil moist. Eoots extend only a little way, and consist of a thick mat around the 
