By means of this cover used on an ordinary incineration dish a 

 perfectly white ash can be obtained at a temperature much lower 

 than what is usually necessary for incineration. In fact the faintest 

 dull red heat on the bottom of the dish will, in a few hours, produce 

 perfect incineration, when using the cover. 



ASH ANALYSES OF SAMPLES OF ONIONS. 



The following statement of ash analyses refers to a series of 

 samples of onions raised by Prof. Wm. P. Brooks, Agriculturist of 

 the Hatch Experiment Station of the Massachusetts Agricultural 

 College, with the aid of different manurial substances. They were 

 kindly furnished by him to test the merits of the above apparatus 

 and to furnish a practical illustration of the question under discus- 

 sion. The results of analyses are in every instance controlled by 

 duplicate determinations and refer to parts per hundred parts of dry 

 matter. Onions dried at ioo° C. 



Laboratory Number. 



Sand, 



Soluble Silica (SiO.,), 



Iron and Alumina oxides (AloFCoO.j), 



Calcium oxide (CaO), 



Magnasium oxide (MgO), 



Phosphoric acid (PoO,), 



Sulphur (S), 



Nitrogen, 



Potassium oxide (K._,0\ 



Sodium oxide (Na.,0), 



1.470 

 .163 

 •370 



1-570 

 .164 



•358 



3.6103.750 



2.0Io'2.320 

 .628'; .713 

 .I98I .226 



i.96o'2.o30 

 2.300 2.380 

 1. 150 1.250 



1.500 



.204 



.585 



3.480 



2.280 



•850 



•243 



2.520 



1. 160 



1.860 



Analyses were made by D. L. Cleaves, resigned March i, 1903. 



