28 S. W. Johnson on Assimilation of bodies by Vegetation. 
viz: July 28th, 0°0822 grm., Aug. 26th, 0°0822 grm., Sept. 16th, 
01644 grm., Oct. 8d, 0°0822 grm. 
The nitrogenous additions contained in each case, 140 grm. of 
nitrogen, and were strown, as fine powder, ever the surface of 
the soil. . 
It not being practicable to attend to the germination of other 
seeds, urea was not experimented with. ‘This deficiency was of 
soil Nov. 8th. : 
The plants exhibited striking differences in their development. 
No. 1, (no added nitrogen) produced in all seven slender leaves 
and attained a height of seven inches. At the close of the ex- 
periment, only the two newest leaves were perfectly fresh, the 
next was withered and dead throughout one-third of its length. 
The newer portions of this plant grew chiefly at the expense of 
the older parts. No sign of floral organs appeared. 
No. 2, fed with uric acid, was the best developed plant of the 
series. At the conclusion of the experiment it bore ten vigor- 
ous leaves, six of which were fresh and two but partly withered. 
It was 14 inches high and carried two rudimentary ears (pistil- 
late flowers), from the upper one of which hung tassels six 
inches long. : 4 
. No. 8, supplied with hippuric acid, bore eight leaves, four of 
which were withered, and two rudimentary ears, one of which 
was tasseled. Height 12 inches. — 
No. 4, with hydrochlorate of guanine, had six leaves, only one 
withered, and two ears, one of which was tasseled. Height 12 
inches. 
These experiments, together with a large number of others _ 
simultaneously undertaken, failed to give satisfactory results 
from the unfavorable situation of the only apartment at dispo- 
sition for conducting them in. The light was good but for a 
small part of the day, and very unequally distributed at that. 
For this reason, chiefly, most of the plants made but impe 
growth and therefore the laborious analyses which would have 
properly supplemented the observations on growth were not at- — 
tempted. 
* This result has been recently confirmed by Hampe of Géttingen who has made 
RT ed eae 8 tp 
urea, Hampe found in the well developed plants—stems leaves Has 
roots—evident quantities of ure Fs ’ slit = ——— : 
eet aeahins SOUR” ee eas ey Ry COORONG Pe Same aah eee SC 
