THE SOURCES OF THE NITROGEN OF VEGETATION, ETC. 565 



as he used in his experiments ; but as too many were broken in transit to use these 

 entirely, it was decided to use pots and pans the same as for our other experiments in 

 185 S. The soil, ash, &c., were also prepared in the same way as for the other expe- 

 riments of 1858 — the ash, however, being saturated with sulphuric acid and re-ignited 

 before being used, as in a few only of the other cases; for description, see pp. 470-472. 



Pot 1 — Wheat ; eight seeds. 

 Pot 2 — Barley ; eight seeds. 

 Pot 3 — Oats; eight seeds. 

 Pot 4— Beans ; three seeds. 



June 11. — "Wheat, Barley, and Oats ; seeds set, and the pots placed over sulphuric acid, 

 and covered with a shade. 



June 12. — The three pots removed to M. Ville's Case. 



June 19. — Wheat, Barley, and Oats all up, and looking green and healthy. 



June 25. — Cereals all about the same size, with three leaves each ; wheat quite pale, 

 barley and oats green at the top, and lower leaves dead. 



The Case was opened, and the pot of three beans put in. 



July 1. — Wheat pale and blanched ; barley and oats, lower leaves dead, upper ones 

 green and growing. 



July 3. — All the Cereals getting quite pale ; beans healthy. 



July 14. — Bean, three plants up; two cotyledons and two leaves on each, healthy. 

 Wheat, seven plants ; 4 to 6 inches high ; four leaves on each, upper green, lower dead. 

 Oats, seven plants; very like the wheat; but little more disposition to form stem. 

 Barley, eight plants ; much like the oats. 



August %. — Beans, 4 mches high; lower leaves dead, and show a white mould; small 

 stems putting out languidly. Barley, eight plants ; 4 to 5 inches high ; lower leaves 

 yellow and dead ; upper blades green ; stems appear mouldy. Oats, seven plants about 

 5 inches high ; lower leaves dead and mouldy ; upper part of stem green, and slightly 

 swelled as if going to head. Wheat, very much like the barley. 



August 17. — Cereals appear to have nearly done growing; beans dying. 



September 7. — Beans dead. Wheat green at the tops, but dead below ; 4 to 6 inches 

 high ; about ten leaves each. Oats nearly dead. Barley nearly dead. 



October 24. — Wheat still green at the top ; oats and barley dead. Beans dead (not 

 analysed). 



November 6. — Plants taken up. Notes as under: — 



Wheat. Seven plants ; 4 to 5 inches high ; no nodes visible ; little tendency to form 

 stem ; lower leaves dead ; top leaf green, and on some the next greenish yellow. Soil 

 moist. Very little root. 



Oats. Seven plants, 4 to 6 inches high ; about six leaves each ; generally four nodes 

 risible ; most forming head. Roots but little distributed ; very little below 1-| inch ; 

 fewer and more slender than those of the wheat. All the plants dead or ripe, but not 

 decomposed ; the stems firm and elastic. 



Barley. Eight plants, 4 to &$ inches high ; two to four nodes risible in all ; six or 



