554 ant. J. b. lawks, dr. oiusetit, and DB. PTJGB OB 



ones yellow ; the newer and upper leaves green, healthy, and vigorous ; marked im- 

 provement since adding the ammonia-solution on June 10, the effect of which n 



manifest within two days after the addition. 



June 21. — Plants 5 to 7 inches high, with four leaves each ; lower leave* dried up, 

 hut upper ones green and vigorous; obviously improving; forming stem with nodes. 



,/,,/y 4. — Plants 7 to 8 inches high, with five to seven leaves each; the newer ones 

 broad, well developed, and of a deep green colour; upon the whole vigorous. Second 

 pipettc-ful of the ammonia-solution added. 



[Drops of water accumulate as described in reference to No. 1 of this date.] 



July 11. — Plants 8 to 9 inches high, with six or seven leaves each; lower ones pale 

 yellow, upper ones green and vigorous. One of the stems sending out a shoot at its ba«e. 

 Third pipettc-ful of ammonia-solution added. 



July 22. — Growing very well ; tillering very much. Fourth pipettc-ful of the ammonia- 

 solution added. 



July 29. — Plants 12 to 10 inches high; one with six shoots 4 to 8 inches long; one 

 with one shoot 3 inches long ; and the other with two shoots just forming ; shoots, and 

 upper leaves, green. The ammonia seems to induce multiplication of shoots instead 

 of upward growth ; no nodes clear of the sheath. Fifth pipette-ful of the ammonia- 

 solution added. 



August 10. — Green and flourishing. 



August 24. — Very similar to Wheat No. G at this date. 



September 20. — Plants taken tep : — 



The lower leaves begin to lose colour considerably, no increase of growth apparent for 

 some days, nor any tendency to form seed ; hence, the season being far advanced, the 

 plants taken up. 



Great development of root; the plate under the pot covered with a dense network 

 ramified from a few fibres extended to the bottom of the pot ; a similar network at the 

 bottom and partially up the sides within the pot ; comparatively little in the centre of 

 the soil. 



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



No. 8. — Barley (1857); four seeds ; prepared soil; with nitrogenous manure. 



(See Plate XV. fig. 8.) 



June 9. — Three plants up ; two 1^ inch and one 3^ inches high ; colour pale. 



June 10. — A pipettc-ful of ammonia-solution ( = '00578 gramme N.) added to the soil. 



June 15. — Three plants ; about 4^ inches high ; each with two leaves and another 

 forming. Improved by the ammonia added June 10, but not so much as the Wheat 

 No. 6. 



June 19-20. — During thenight the shade was cracked, from the bottom in the quick- 

 silver, 9 inches upwards. The pot with its contents was removed and put under a shade 

 over sulphuric acid. After four days it was returned to its place, and covered with the 



