186 
IOWA ACADEMY OF SCIENCE 
Crystallized. 
Original sample Coarse (per cent) Pine (per cent) 
(per cent) 
TJnground 61.13 62.45 60.67 
Ground 33.21 32.35 32.01 
Loss 27.94 30.10 28.66 
Manganese Chloride, MnCL. 4 H 2 O. 
A very pure specimen of the salt (Kahlbaum’s) was at hand. No attempt was 
made to crystallize it, as the number of molecules of water of crystallization 
it may contain depends upon the temperature. The crystals become pure white 
when ground. 
Per Cent 
Unground 34.03 
Ground 32.11 
Loss 1.92 
I desire to express my hearty thanks to Mr. C. E. Gillette for making the 
analyses, and for grinding the specimens as described in this paper. 
