050 ME. J. B. lawks, mi. GILBERT, AND DK PTJGU3 



extended to the lower part of the pot; but the great mas. remained neax the ba ie -^f the 

 stem. Total quantity of root very small compared with that of wheat No. man 

 with ammonia-salts. For general character of root-development, see Plate XV. 6g. L5. 



For method of further treatment sec pp. 543, 511. 



No. 2. — Barley (1857); six seeds; prepared soil; without nitrogenous manure. 



(See Plate XV. fig. 2.) 



June 9. — Six plants; 2 to 3 inches high, with two fully developed leaves; tips of 

 some of the leaves slightly yellow. 



June 15. — Three plants with three leaves, and three with two leaves each ; tips of 

 lower leaves slightly yellow, but general appearance healthy. 



June 24. — Plants 4 to G inches high, with three or four leaves each ; much the same 

 condition as wheat No. 1 at this date. 



July 4. — G to 7 inches high, with four or five leaves ; paler than wheat No. 1 ; 

 looking sickly. Drops of water on tips of leaves and inner surface of shade : see Note 

 thereon to wheat No. 1, same date. 



July 11. — Lower leaves drying up ; upper ones growing a little, apparently at expense 

 of the lower. Stems of these and the other barley plants reddish, and have been so 

 since the formation of true stems with nodes. The barleys form stem more readily than 

 the wheats, which are more leafy. 



July 22. — Not much improvement. 



July 29. — Only two small leaves at the top green; the amount green at one time 

 does not increase ; lower leaves dry up as new ones form. 



August 10. — Very little change, except that one stem shows slight indications of 

 heading. 



August 24. — Plants taken tip : — 



Six plants, 5 to 17 inches high, with six to nine leaves on each plant. Two indicate 

 slight tendency to heading, the sheath being swollen ; but growth obviously ceased, the 

 two upper leaves having at last lost colour and dried up. On opening, one head showed 

 a rachis 2 inches long. The plant was very dry, so no fresh weight taken. 



Prepared and analysed as described at pp. 543, 544. 



No. 3. — Barley (1857) ; six seeds ; prepared pumice ; ivithout nitrogenous manure. 



(See Plate XV. fig. 3.) 



June 9. — Six plants, 2^ to 4 inches high ; more developed, but more slender than the 

 barleys in soil (Nos. 2 & 8). Leaves turning yellow at the tips. 



June 15. — Six plants, G inches high, each with three fully developed leaves; tips of 

 lower leaves dried up ; middle leaves have yellow tips ; upper ones pale green but 

 healthy. Plants appear to have almost done growing. 



June 24. — Height about the same ; three or four leaves each plant ; lowest dried up, 

 uext drying, and upper ones green. 



