BULLETIN OF THE BUSSEY INSTITUTION. 299 
The trials with mixtures of peat and sand, and of sand and clay, 
as recorded in the tables, were simultaneous with the experiments 
upon loams and were in contrast with them. One of the peats 
which was obtained from the Bussey Farm (see vol. 1, page 135) 
contained 1.2% of nitrogen and 6.98% of ash ingredients. For 
the experiments, 250 grm. po:tions of it were mixed with 375 
germ. portions of Berkshire sand. The other peat, from a pond- 
hole in Dabney woods, contained when air-dried 0.84% of nitrogen 
and 43.56% of ash. 300 grm. portions of this peat were mixed 
with 450 grm. portions of the Berkshiressand. It turned out, 
however, that the mixture of Dabney peat and sand was insuffi- 
cient to fill the jars completely, and the plants suffered from a cer- 
tain sogginess in this particular case. ‘* Kaolin” is a trade name 
in Boston for a material, used as a kind of fire-clay, which con- 
sists of a mixture of fine clay and a multitude of very minute 
scales of mica. It seems to have been formed by the disintegra- 
tion of a feldspathic and micaceous rock. For the experiments, 
80 grm. portions of it were mixed with 1200 grm. portions of 
sand. The Pipe-clay was a compact fat clay, free from foreign 
matters, such as is sold as China clay in Boston, for purposes of 
luting. For the experiments, 45 grm. portions of it were mixed 
with 1300 grm. portions of Berkshire sand. For the experiments 
where Berkshire sand was used by itself, 1850 grms. of it were 
put in each jar. P 
For remarks upon the experiments with clay see beyond, 
page 309. 
It will be noticed that in the series of experiments with pure 
loam an unusually large quantity of material (2 kilogrammes) 
was employed and that six seeds were sown instead of the usual 
number, three. For this particular set of experiments I had made 
a number of large glass jars, like beakers, only thick and strong. 
These jars were subsequently abandoned, inasmuch as they were 
found to be less convenient in practice than ordinary quart 
preserve jars and seemed to have no special merit. 
The strength of the solutions employed in these experiments 
were as follows : Sulphate of Potash, Phosphate of Potash, 
Sulphate of Magnesia, Sulphate of Lime, and Chloride of Potas- 
sium 0.25 grm. each to one litre of water. Nitrate of Lime * 
1 grm. to the litre, Nitrate of Potash 1.25 grm. to the litre, and 
Nitrate of Ammonia 0.125 grm. to the litre in most instances. 
The most noteworthy results of these trials was the manifest 
* It is noticeable of nitrate of lime even more than of any other of the 
nitrogenized solutions, that it imparts a peculiar green color to the plants that 
receive it, and tends to keep them young, ¢. e. it hinders the final ripening 
or maturing of the plant. 
