THE SOUECES OF THE NITEOGEN OE VEGETATION, ETC. 5G1 



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 ; lower ones 

 yellow and dried up ; upper pale yellowish green. A sixth plant, smaller. A pipette-ful 

 of the phosphate-solution added. 



June 7. — A pipette-ful of the phosphate-solution, and a pipette-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 20. — Plant (a) dead; cause not obvious. Plant (b) 10 inches high; as last 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 sulphuric- 

 acid solution added. 



July 14. — Plant (b) 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 ^ inch long), and apparently live at the expense 

 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 3|- to 4 inches long ; the upper thread-like and 

 drooping. Plant (b) 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 leaves ; 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 2^ inches long; the upper 

 one 1J inch long, pale green, and quite erect, apparently the last effort of the plant, no 

 new leaves forming. Plant (c), divided just beneath the soil into three shoots; two 

 apparently suckers from the other, each 3 niches 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 2 \ inches long. Plant (e) 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 wp : — 



Evidently done growing ; four stems swelled for head ; all leaves except the uppermost 

 dried up. Eoots not much distributed ; general characters much like those of barley 

 without nitrogenous manure last year (1857). Soil moist, loose, and open. 



Preparation and analysis as described at pp. 543, 544. 



4g2 



