THE SOURCES OF THE NITROGEN OF VEGETATION, ETC. 575 



August 17. — Shade full of vegetable matter. Wheat, Barley, Oats, and weeds grow- 

 ing ; but Leguminous plants dead. 



September 7. — A good deal of growth yet. 



October 5. — A good deal of grass and weeds growing. Cereals ripening. 



October 24. — Shade full ; experiment stopped. Wheat not quite ripe. Barley and 

 Oats dead ripe ; Beans and Peas all dead ; a little Clover still living ; some grass, and 

 other weeds, green, and some seeded. The whole soil filled with roots, many distributed 

 through the flints, and a large quantity growing in the pan under the pot. 



No. 16. — Buckwheat (1858); forty-two seeds (1 gramme) ; prepared soil; 



with nitrogenous manure. 



August 20. — Seed sown, and the pot placed over sulphuric acid, and covered with a 

 glass shade. 



August 24. — Pot removed to its shade on the stand. Several plants up. 



September 7. — A pipette-ful of the sulphate-of-ammonia solution added (=0'00359 

 gramme N.). Plants growing well. 



October 5. — Second pipette-ful of the sulphate-of-ammonia solution added. Much 

 more vigorous than the Buckwheat without ammonia (No. 7) ; about twenty plants ; 5 

 to 7 inches high ; four to six leaves on each. 



October 24. — Third pipette-ful of the sulphate-of-ammonia solution added. Growing 

 well ; 5 to 7 inches high ; six plants in bloom. Comparing with No. 7, the influence 

 of ammonia here is very marked, as shown in size, vigour, and maturation. 



November 22. — Plants taken up : — 



Twenty-four plants ; 4 to 7 inches high ; five to seven leaves on each ; six stems have 

 flowered ; bloom gone off and rudimentary seed formed ; would probably have growu 

 more but for frost. 



Roots less in proportion to upward growth than with Buckwheat without ammonia ; 

 none deeper in the soil than 1^ to 2 inches ; slim, delicate, and but little distributed. 



Soil loose and porous. 



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



No. 17 (1858). — Plants grown with Nitrogenous Manure in M. G. Ville's Case. 



The same descriptions of pot, pan, soil, ash, &c, were used for these experiments as 

 for the others, as explained at page 565. Plants as under : — 



Wheat, four seeds ; Barley, four seeds ; Oats, four seeds ; Beans, three seeds. 



June 29. — Seeds set, and the pots placed over sulphuric acid, and covered with a glass 

 shade. 



July 5. — Pots removed to M. Ville's Case. 



July 14. — A pipette-ful of the sulphate-of-ammonia solution given to each pot 

 ( = 0-004 gramme N). Wheat, four plants just appearing; Barley, three plants 1^ inch 



mdccclxi. 4 I 



