THE SOURCES OF THE NITROGEN OF VEGETATION, ETC. 557 



Eoots by no means so abundant as those of Wheat with ammonia-salt ; only a few 

 fibres extended through the hole at the bottom, or to the sides of the pot. 

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



No. 10. — Beans (1857); two seeds; prepared soil; intended to have nitrogenous manure. 



June 9. — Only one plant up ; 2 inches high ; turning black and obviously dying. 



For particulars of taking up, setting fresh seeds and recommencement of the experi- 

 ment, see remarks made on June 9 to Bean No. 5, p. 552. 



June 15. — Not yet up. 



June 24. — Two plants just appearing. 



July 4. — Two plants well up and growing ; leaves just opening. 



July 11. — Two plants; 6 to 8 inches high; leaves deep green. 



July 22. — Green, healthy, and rigorous. 



July 29. — Nearly as at last date, but somewhat declining. 



August 10. — Obviously dying. 



August 24. — Dead. 



The season too far advanced to repeat this experiment. 



No. 11. — Beans (1857); two seeds; prepared pumice; intended to have nitrogenous manure. 



June 9. — One up ; slender ; black spots on the leaves ; obviously unhealthy. Taken 

 up, and the experiment recommenced ; for particulars of resetting, &c, see remarks to 

 Bean No. 5 of this date, p. 552. 



June 15. — Not yet up. 



June 24. — Two plants just up. 



July 11. — Apparently not going to grow. 



July 22. — Dead; the season too far advanced to repeat this experiment. 



No. 12. — Wheat, Barley, and Beans (1857); Wlieat and Barley three seeds each, Beans 

 two seeds; in rich Garden soil. (See Plate XV. fig. 13.) 



May 18. — Seeds of wheat, barley, and beans, all sown together in a single pot of 

 good garden soil, and placed under a shade (No. 12), to be supplied with washed 

 ah - , &c, just as in the other experiments. The seeds germinated well. 



May 28-29. — During the night, owing to a leakage of water from the reservoir into 

 the vessel A (see description at p. 476 et seq., and Plate XIII.), it passed over into the 

 sulphuric acid and carbonate of soda wash-bottles, and the mixed liquid passed into the 

 shade to the depth of some inches, and destroyed the experiment. 



May 30. — Plants from seeds which had been set at the same date as the foregoing, 

 were transplanted into a fresh pot of garden soil, which was placed under the shade, 

 and the experiment recommenced. The wheat and barley plants were about 5 inches, 

 and the beans about 4 inches high. 



June 15. — Healthy, and growing rigorously. 



June 24. — Three wheats, three barleys, and two beans. Wheat 14 inches, barley 



