BEPOET ON VARIOUS MANURES AT CHISWICK. 
45 
vigorous than in 3 and 4 ; main fibres more wiry than in any, 
except 6. 
> Box 6 (mineral and nitrate). Eoots 18 inches long ; main fibres 
more wiry and stouter than in any of the rest ; fibrils m.ore nume- 
rous than in 5. 
Box 2, therefore, had the finest and most densely matted roots. 
It is farther interesting to compare the condition of the plant 
in October with that of the root in the following April. The plant, 
it may be assumed, did not grow much after October. How much 
the roots may have extended during the period from October to 
April, we have, unfortunately, no means of determining. The com- 
parison is indicated in the annexed Tables. In the case of the Dac- 
tylis, the most salient features were the great development (/) of 
the root in box 2 as contrasted with the low state {a) of the plant 
in October. Here we have, if this observation can be relied on, 
a striking antagonism between root and " top." In most of the 
other boxes comparatively little difterence existed between top and 
root ; but in box 5 an antagonism similar to that in 2, but less in 
degree, was observable. 
• The condition of the roots in April and that of the plants in 
October may be thus illustrated. 
1 
2 
3 
4 
5 
G 
Boot (April 1870) . . 
a 
/ 
e 
cl 
h 
c 
Plant (Oct. 18G9) .. 
I 
a 
f 
d 
G 
c 
ii. AntTioxanthum, 
Box 1. Plant tufted. Boots fibrous ; fibres 7-8 inches long, 
slender, weak, much branched ; fibrils horizontal. 
Box 2. Eoots of the same character as in 1, but superior in 
vigour and degree of branching. 
Box 3. Superior to 2. 
Box 4. The best-developed of all. 
Box 5. Superior to 2, inferior to 3 and 4. 
Box 6. About equal to 5. 
But little comment is needed in this case^ as the roots presented 
but little difi'erences inter se. 
The roots in the nitrate-of-soda box (4) were the best-developed. 
If the condition of the plant in October be compared with that of 
the root in April, it will be seen that the correspondence was in all 
