BULLETIN OF THE BUSSEY INSTITUTION, 17 
farmers. Wessely * in particular has not only himself made a number 
of analyses of sands, but has compiled a considerable amount of in- 
formation relating to this special subject. ‘The following particulars 
are extracted from his treatise which relates to the planting of sand 
dunes. 
ALLUVIAL Drirt-Sanps, 
Maxima and minima obtained in several analyses : — 
(K20) (205) (CaO) 
2 Potash. Phosphoric Acid. Lime, 
From sea-coast dunes in North Western 
SPOTINAN Gene) wo wee. . 0.738-0.89 trace 0.14 
From inland dunes in North Western Ger- 
many (ordinary sand) . . . . . 0.65-1.99 trace trace to 0.03 
From inland dunes in North Western Ger- 
neta sand) 2. fk 1.31 trace 0.04 
From Hungary, dunes near Pesth. . . . 0.86 ae a 
From Hungary, dunes in the Banat. . 1.06-1.45 trace to 0.08 5.31-9.06 
Of the samples of sand examined in the Bussey laboratory, it may 
be said that the scouring sand from Essex contained so much visible, 
undecomposed mica, that the presence of potash was fairly to be in- 
ferred even from the most superficial observation. The pit-sand con- 
tained many grains that were evidently not pure silica, as was explained 
on page 56, Vol. I. ‘The coarse dune-sand from Provincetown, though 
it contained a much larger proportion of quartz grains than the pit- 
sand, was by no means free from particles of other minerals. The 
Berkshire sand on the contrary is a sand of exceptional homogeneity 
and of exceedingly attractive appearance. It seems to consist entirely 
of minute, angular, glistening, white fragments of pure quartz ; though, 
from the very whiteness and brilliancy of the mass, it would be diffi- 
cult to distinguish by mere inspection one particle of it from an- 
other. I have not yet found time to analyze a sample of this sand 
mechanically by way of elutriation, or to verify my suspicion that it 
may perhaps contain a certain percentage of minute flakes of mica or 
kaolinite. ‘The Berkshire sand, as obtained by me for experiments 
upon the growth of plants, has been washed with water in order to 
remove any specks of dirt that might injure its appearance in the eyes 
of the flint-glass makers by whom it is chiefly used, and has been 
thereafter dried in kilns. 
* “Der europiische Flugsand und seine Kultur,” Vienna, 1873, pp. 48, 303, 
805, 312. 
VOL. II. 2 
7 
