Rotation of Crops. 
609 
on the one hand, of the growth and removal of a leguminous 
crop, and on the other of fallow, so far as the third year of the 
course is concerned ; yet, where the manurial conditions were 
not defective, there was even more wheat succeeding the legu- 
minous crop, than succeeding the fallow. The influence of the 
conditions of the third year of the course does not, however, 
seem to extend in any marked degree to the crops succeeding 
the wheat ; that is, to the roots commencing the next course, 
and to the barley succeeding the roots. 
So far as the roots are concerned, the average results over 
the eight courses show, both without manure and with super- 
phosphate alone, that is on the most exhausted plots, that the 
advantage, if any, is more with the fallow than with the legu- 
minous plots ; whilst, with the full manure, there is scarcely any 
difference of result clearly traceable to the treatment of the land 
in the third year of the preceding courses. Over the last two 
courses, again, without manure no benefit accrued to the root-crop 
by the growth of the leguminous crop as compared with fallow. 
On the superphosphate plots, however, now with potash, soda, 
and magnesia, as well, and doubtless more leguminous produce 
accordingly, there were more roots on the leguminous than on 
the fallow plots ; but, with the full manure, there was practically 
no difference in the produce of roots on the fallow compared 
with the leguminous crop plots. Obviously, the fact that there 
was not materially less produce of roots where the leguminous 
crops had been grown and removed, as compared with where 
the land had been fallow, is of itself evidence of the beneficial 
rather than exhausting effect of their growth and removal, so far 
as the requirements of the succeeding crops are concerned. 
Nor is the effect of the growth and removal of a leguminous 
crop, compared with fallow, very definite on the barley succeed- 
ing the manured roots. It is, however, over the eight courses, 
in favour of the growth of the leguminous crops ; and, though 
with very small crops, it is, excepting without manure, much 
more so over the last two courses. 
From the results as a whole it maybe concluded that, where 
the land was the most exhausted, the growth of the leguminous 
crop was correspondingly limited, and, being at the expense of 
the little accumulation that there was, its removal further ex- 
hausted the immediately available supplies; whilst, where the 
accumulations were greater, the growth was dependent on a 
more extended root- development, and therefore greater range 
of collection ; the luxuriance was much greater, and the surface- 
soil at any rate, gained by an increased amount of highly nitro- 
genous leguminous crop-residue. It has further been seen, that 
