THE SOTJECES OE THE NITEOGEH OF VEGETATION, ETC. 553 
ammonia appears to have ceased. Second pipette-fol of ammonia-solution (same quan- 
tity) added. 
July 11. — Two plants, 10 inches high ; seven leaves each ; upper ones deep green, 
broad, and vigorous. Third pipette-ful of the ammonia-solution added. 
July 22. — Growth vigorous ; shooting out at the base of the stems. Fourth pipette-ful 
of the ammonia-solution added. 
July 29. — Much greater tendency to form leaf than stem. One plant with four, and 
the other with two subdi-visions. 12 to 16 inches high, the height greatly due to the 
length of the leaves. Not a single node clear of the sheath of the one below it; thus 
essentially different from the barleys, which have great tendency to form nodes and stem. 
Fifth pipette-ful of the ammonia-solution added. 
August 10. — Green and flourishing. 
August 24. — Plants 17 to 20 inches high; ten to twelve leaves on each; upper ones 
long, broad, and green ; lower ones dried up. But little tendency to form stem ; leaves 
lai'ger than on plants in the field ; some 12 inches long and ^ inch mde ; no nodes clear ; 
the leaves spring out so close together as to appear almost opposite. Five stems from 
the two seeds. 
October 2. — Plants taken iig } : — 
One seed has given three strong and one small stem ; another one stem ; the third 
did not grow. Leaves veiy numerous and close together, giving several thicknesses of 
sheath around the stem, and hiding all the nodes ; lower leaves dried up ; upper leaves 
and central axis of growth green. Condition nearly stationary for the last two or three 
weeks. Average height of plants about 18 inches. 
Soil quite moist throughout ; also soft, and spongy, rather more so than the pumice 
soils ; a little water remained in the plate below the pot. 
Boots much, but very irregularly distributed — a large bunch around the base of the 
stem ; small, long, isolated roots extended to the bottom and up the sides of the pot ; 
quite a mass of ramified roots over the bottom, and somewhat up the sides of the pot ; 
and a greater mass in the dish under the pot, forming a circular web the size of the 
bottom of the pot. A crack in the bottom of the pot was penetrated with roots through- 
out, showing, perhaps, that more openings than the one hole at the bottom might be 
advantageous. For representation of the root-development, see Plate XV. fig. 14. 
Preparation and analysis as described at pp. 543, 544. 
No. 7. — Wheat (1857); three seeds; jyrejpared jyumice ; with nitrogenous manure. 
June 9. — Three plants up, 3 to 4 inches high ; each with three leaves completely 
formed, of which the tips are slightly yellower than those of Nos. 1 and 6, but no appear- 
ance of diseased condition in any of the wheats. 
June 10. — A pipette-ful of the ammonia-solution ( = ’00578 gramme N.) added to 
the soil. 
Jme 15. — Plants 5 to 6 inches high, with four leaves each; the tips of the lower 
4 F 2 
