1. 



2. 



3. 



VARIETIES OF BONE-MEAL USED IN THE HALLE EXPERIMENTS. 



PERCENTAGE ANALYSIS. 

 BRAND. FURNISHED BY 



Untreated ") 



Kaw Bone-meal. I tt t» i i • t- „+i „ 

 ^, ,. >H. Paul HI Koethen. 



Glne-tree f 



Bone-meal. j 



Steamed The Hannover Artificial Fertilizer 



Bone-meal. Factory, Linden (near Hannover). 



4. JJ^^^^^ , Beyerlein & Schmidt, Altenburg. 

 Bone-meal. •' 



5. Raw Bone-meal. ) i^ . •- . n\ ,-„„i 

 ^ ^ Fiitntzsch Chemical 



6. ^;'"e-"'ee 1 Works (near Leipzig). 

 Bone-meal. J ^ 



Sample No. 4 appears in trade, falsely, nndcr the name "steamed 

 bone-meal." It is really a mixtnre of raw bone-meal and glue-free 

 bone-meal. The relative fineness of these meals was as follows : 



Size of Particles 12 3 4 5 6 



in iiiilliineters" . 



Larger than 1 m.m. 0.4 — — 4 6.4 — 



" 0.5 " 16.0 10 5 25.2 32.0 15.3 0.6 



" " 2 " 13.0 9.5 12.5 6.4 5.0 2.6 



" " 0.1 " 29.1 22.7 30.2 24.6 31.8 18.7 



Smaller thanO.l " 41.0 57.3 32.1 33 41.5 78.1 



100.0 100.0 100.0 100.0 100.0 100.0 

 Each of the pots contained 13.2 pounds of dry earth, resting on a 

 layer of sand. The earth was kept in a uniformly moist condition, 

 at the so called "optimum," i. e., with from 60 to 70 per cent of 

 the full amount of water present which the soil could hold. To every 

 pot was added ten grams of carbonate of lime and three grams of a 

 mixture of equal parts of chloride of potassium, sulfate of potash, 

 and sulfate of magnesia. The nitrogen, necessary for the develop- 

 ment of the plant, was given in the form of nitrate of ammonia. As 

 bone-meals contain very difl^erent proportions of nitrogen, the 

 pots having those richer in this element would have received 

 more, for the same amount of phof-phoric acid, than those with less 

 nitrogtn. These differences were cancelled l)y the addition of nitro- 

 gen in the form of horn-meal to all the ])Ots, in the proportion 

 requisite in each case. The pots which received no bone-meal, and 

 those with superphosphate were supplied, of course, with their proper 

 proportions of nitrogen in the form of horn-meal. 



