170 BULLETIN OF THE BUSSEY INSTITUTION. 
first been reduced somewhat by the removal of a succession of crops 
grown without addition of any manure. Compare, for example, a 
set of Bavarian experiments reported by Fraas (Hoffman’s Jahresbe- 
richt, 2, 143), in which this idea was put in practice. 
No. 8.— Analyses of several Foreign Superphosphates of Lime ; 
with Remarks on the Cost of vmporting Superphosphates from 
Hurope. By F. H. Storgr, Professor of Agricultural Chem- 
istry. » 
An attempt recently made by the Trustees of the Massachusetts 
Society for Promoting Agriculture, to determine whether it would be 
practicable, economically speaking, for American farmers to import 
superphosphate of lime from Europe, led to the following analyses of 
samples of that substance : — 
I. A sample given to the Massachusetts Society for Promoting 
Agriculture by Mr. Lawes of Rothamsted, England (9, his letter 
on page 181). 
Of matters valuable as manure the specimen contained : — 
Phosphoric acid soluble in water . aciieaie - 8.31% 
me ‘¢ insoluble “ , : . 1.63 
Total ; : : 9.94% 
The specimen gave off 15.33% of moisture vb heated to 212°. 
II. A sample warranted to contain 10% of soluble phosphoric acid, 
bought of Dr. L. C. Marquart, in Bonn, Germany. 
Phosphoric acid soluble in water . ; ’ « iulatOZ 
* “* insoluble “ : : ' 5.58 
Total ; ; F 13.37% 
The specimen gave off 13.07% of moisture ue ented to 212°, and left 
71.10% of ash on being ignited. 
III. A sample warranted to contain 15% of soluble phosphoric 
acid, bought of Dr. Marquart of Bonn. 
Phosphoric acid soluble in water . : on 
“ ‘¢ insoluble ‘ : ‘ - 1.58 
Total (ensteiom 15.77% 
The specimen gave off 20.06% of moisture at 212°, aaa left 58.60% of ash 
when ignited. It contained 3.47% of sand, etc., insoluble in acid. 
