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XXIX. — Further Report of Experiments with different Manures on 
Permanent Meadow Land. By J. B. Lawes, F.R.S., F.C.S., 
and J. H. Gilbert, Ph.D., F.R.S., F.C.S. 
The object of tlie present Report is to give an account of tlie pro- 
duce of liay per acre, the chemical composition of the hay, and 
the amount of certain constituents removed from the land, in the 
fourth, fifth, sixth, and seventh seasons of experiments on the 
application of different descriptions of manure, each applied 
(with some few exceptions or modifications) year after year on 
the same of a series of plots of permanent meadow land. The 
results obtained on the above points in the first, second, and 
third years, and on the variation in the description of plants 
developed in the third year, were given in vols. xix. and xx. of this 
Journal ; and in the last Number (vol. xxiv., part 1) a detailed 
account of the description of plants developed by the different 
manures in the last or seventh season (1862), was given. 
It is proposed to give the numerical results obtained during 
the last four years in regard to the points in question in some 
detail, but to comment on them much more briefly than it was 
found desirable to do when treating of the subject for the first 
time, in the Report above alluded to, to which we would refer the 
reader for a more detailed consideration of some of the points now 
discussed more briefly. We shall, however, give in the Tables a 
condensed summary of the results obtained over the whole seven 
years of the experiments, side by side with those of the later 
years, and in the course of our comments frequently compare the 
earlier and the later results. 
The following is a detailed statement of the manuring of each 
plot ; and, unless otherwise stated, it has been the same every 
year since the commencement of the experiments in 1856. The 
quantities per acre are given. » 
Plot 1. Unmanured. 
Plot 2. Unmanured (duplicate plot at the further end of the 
series). 
Plot 3a. Superphosphate of lime ; composed of 200 lbs. of bone 
ash, and 150 lbs. sulphuric acid of sp. gr. 1*7. 4th 
season (commencing in 1859) ; sawdust alone the 
three previous years. 
Plot 3Z». Superphosphate of lime ; and 400 lbs. ammonia-salts 
(ecjual parts sulpliate and muriate of commerce, sup- 
plying about 82 lbs. nitrogen per acre). 4th season 
(commencing in 1859); the tlaree previous seasons 
sawdust alone. 
Plot 4. 400 lbs. ammonia-salts. 
