IIEPOKT ON VARIOUS MANURES AT CniSWICK. 
27 
in some cases the fluctuations in growth may have been simply con- 
temporaneous with the meteorological changes, and not really de- 
pendent on them; but where they follow atmospheric changes it is a 
fair inference to conclude that they were the effect of those causes. 
Summary of Olservations on the Progress of the Plants from 
May 3 to July 1 inclusive. 
During this period observations were taken at intervals of from 
seven to ten days. These observations had reference to the con- 
dition of the plants in each of the seventy-two boxes, as regards 
health, vigour, degree of branching, tendency to produce flowers, 
&c. Comparative observations were also made between the plants 
in all six boxes of each set. The accompanying Tables show the 
comparative condition of all the plants at the dates mentioned. 
The general condition is indicated by the letters 5, c, e,f— 
a denoting the lowest degree of general vigour, / the highest, as 
previously explained. The state of the plants in October is alluded 
to separately. It is shown in the Tables, in the last column. 
i. Dactylis glomerafa. 
Box 1 (unmanured). The plants presented uniformly the mi- 
nimum degree (a) of vigour. The plants were generally healthy, 
with broad leaves of a bright-green colour. The average height 
of the plant at the end of June was 12 inches, and there was no 
appearance of flower. 
Box 2 (mineral manures). Vigour uniformly low (5) through- 
out ; plants healthy, light green, slightly more luxuriant than in 
box 1, but with no appearance of flower. Average height at the 
end of June 14 inches. 
Box 3 (ammonia-salts). The plants manifested a high degree (e) 
of vigour at first, but declined considerably (to c) during the 
middle and end of May. During June the vigour again increased, 
and at the end of June attained the maximum degree (/). The 
plants were healthy, with broad leaves of a bluish-green colour. 
The height at the end of June would have averaged 20 inches ; 
but the stems and leaves were at this time "laid" by drought. 
No tendency to flower was observed. 
Box 4 (nitrate of soda). Maximum (/) at first, but declined to 
medium in the middle of May ; improved in June, but declined 
again towards the end of that month. The plants were healthy, 
