COMMUNICATIONS. 509 



To THE SeCRETAUY OF THE StATE AGRICULTURAL SoCIETY DeAR SiR : 



The following letter has just been received from Dr. Jackson, 

 containing the most complete analysis ever made of the Iron Eidge 

 ore. The specimen was from the loose ore of the North- Western 

 Company's location. In an article on this ore, published in 

 this report, (see page 358), I have given an analysis purporting 

 to come from Dr. Jackson. I was misinformed, as both of those 

 analysis were made by Dr. Cassels. 



Dr. Jackson finds no phosphorus. Dr. Chilton, of New York, 

 has made two analysis, and finds no phosphorus. E. Daniels. 



State Assayer's Office, } 



32, Somerset st. Boston, Dec. 17, 1857. j" 

 Prof. E. Daniels, 



State Geologist to Wisconsin : 



Dear Sir: — I have analyzed sample No. 3, of the iron ores 

 you left with me, and have obtained the following result: 



It is an oolitic iron consisting of flattened grains, the spere- 

 roids having grains of quartz sand as a nuclei. These grains 

 are cemented together by a clayey like mass of fine ore. 



On chemical analysis, made with the utmost care, the follow- 

 ing reselts were obtained per cent : 



Water, 8.7.50 



Silica, 7.750 



Magniesa, .... 0.640 



Alumina, .... 8.S00 



Oxide o Manganese, - - 1.000 



Lime, - - - - 8.560 



Peroxide of iron, - • - 72.500 — 50.77 metalic iron. 



100.000 



