DE. J. II. GILEEET ON CLOYEE-SICKNESS. 
87 
Series 1. — The plots of this series have received no carbona- 
ceous, and scarcely any nitrogenous manure since the commence- 
ment. On the other hand, some of them have received much 
more of both potass and sulphuric acid, and more phosphoric acid, 
but all less, and generally considerably less, lime and magnesia 
than have up to this date been taken off in the crops. 
Series 2. — These plots have all received a considerable amount of 
both carbonaceous and nitrogenous manures, supplying, on the 
average, about half, but in some cases more than half, as much of 
both carbon and nitrogen as have been taken off in the crops. 
Of potass and sulphuric acid, some of the plots have received 
considerably more, of phosphoric acid rather more or not much 
less, of lime very much more, but of magnesia in all cases less than 
were yielded in the crops. 
Series 3. — The plots of this series have also received a consi- 
derable quantity of both carbon and nitrogen, but all of them less 
than those of series 2. Some of them have received more, or not 
much less, potass, magnesia, and phosphoric acid, considerably 
more sulphuric acid, and very much more lime than were contained 
in the crops. 
These very summary comparative statements relate to the 
whole period from 1849 up to the present time ; and the observa- 
tions which follow will for the most part have reference to the 
same period. But it should be observed that many of the plots 
which now show an excess of removal over supply of certain 
constituents did not do so at the time of the first failures. It 
will presently be seen that failure commenced after growing the 
crop a second time with the interposition of only a single wheat- 
crop. This was the case notwithstanding that at that time, and 
even later, on some of the plots more of all constituents (except- 
ing perhaps carbon) had been supplied in manure than taken off 
in the crops. It was obviously, therefore, not merely a question 
of supply or exhaustion, using the terms iu the same sense as we 
should do in reference to wheat or barley, for example. One 
object of the plan of experimenting followed was, therefore, to 
give time for the proper soil-digestion, or distribution of the con- 
stituents already directly supplied, or which might otherwise 
exist within the soil, in case this might be the condition 
needed. 
As with other leguminous crops, the general result has been 
that mineral constituents applied as manures (particularly potass) 
