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 aaa and covered with a 
glass shade. 
August 24.—Pot removed to its shade on the stand. Several tiie 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 grown 
more but for frost. 
Roots less in proportion to upward growth than with Buckwheat without ammonia ; 
none deeper in the soil than 14 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).—Piants Grown wits NirrocEnovus Manure in M. G. Vitz’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 :-— 
W heat, 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. Viuir’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 14 inch 
MDCCCLXI. 41 . 
