570 MR. J. B. LAWES, DR. GILBERT, AND DR. PUGH ON 
July 28.—Ninth pipette-ful of the sulphate-of-ammonia solution added. 
July 29.—Only two of the seeds germinated; plants as follow :— 
No. 1. (a) Main stem, out of the ground single, and then gives off (b) and (c); is 
22 inches high; lower leaves dead, and lowest shows a fungous growth ; six air-roots (two 
still growing) from first joint or point of separation; five nodes, each giving a leaf, only 
the top one green; head bursting forth. (4) 28 inches high; five nodes, with leaves, 
upper two only growing; stem slim below and thicker higher up; awns of head appear- 
ing. (c) 5 inches high; two leaves; fresh and green. 
No. 2. More vigorous than No. 1, and livelier colour; leaves the ground single; half 
an inch up divides, and also gives off roots which go into the soil; three-quarters of an 
inch higher a second shoot, and more roots given off; one reaches the soil, two growing 
downwards, and several withered; lowest leaves dead and show fungous growth, parti- 
cularly where they lie on the soil. 
August 17.—Tenth pipette-ful of the ammonia-solution added (new solution 
=0°00359N). Plants growing vigorously under the influence of the ammonia; nearly 
at the top of the shade; several heads appearing. 
August 24.—Hleventh pipette-ful of the ammonia-solution added. 
September T.—Twelfth pipette-ful of the ammonia-solution added. 
October 5.—Plants ripening; seven stems with heads; lower leaves of each dead or 
ripe, and two or three upper ones of each green. Some new shoots appearing at the 
base. 
October 24.—Three heads green, the others ripe. 
October 26.—Plants taken up :— 
Only two seeds grew, and gave plants as follow :— 
No, 1. Stem divided a little above the surface of the soil, giving plant (a), and an inch 
higher up divides again, giving (4) and (¢); below the first point of separation the stem 
scarcely thicker than a pin, hard and solid. (a) 34 inches high; six visible nodes; stem 
below the lowest very thin and hard, but larger, soft and succulent higher up; head 
3 inches long, having sixteen joints, with glumes and pales, and awns 4 to 6 inches long ; 
two ripe plump seeds, and others shrivelled up. (4) 28 inches high; five nodes; below 
the lowest stem hard, firm, dry, and almost solid, and but little thicker than a pin; 
stem higher up larger, but still quite delicate; head 13 inch long, with three joints 
barren, and seven with glumes, pales, and long awns, but no seed. (c) 30 inches high ; 
five nodes; lower part of stem not quite so thick as (a) and (6); head ripe; rachis 
25 inches long, with two joints barren, and thirteen with glumes, pales, and awns; also 
some shrivelled seeds. 
No. 2. Stem to 1} inch above the soil little thicker than a pin, quite solid, and firm; 
then a thick and bunchy node and six stems. Stem (a) 18 inches high to rachis; four 
nodes; four leaves; crooked rachis 1} inch long, with three joints barren, and seven 
with glumes, pales, and awns. (0) 21 inches high to head; rachis 25 inches long, with 
three joints barren, and thirteen with glumes, pales, and long awns; four nodes; five 
