296 Field Columbian Museum — Geology, Vol. I. 



and this applies to the chondri as well as to every other part of the 

 stone. In this view I agree fully with Weinschenk as quoted above. 



An analysis of the meteorite was made by Mr. H. W. Nichols, 

 Assistant Curator of the Department, in the laboratory of the 

 Department. 



For this analysis a fragment of the meteorite free from visible 

 oxidation was pulverized and dried at ioo° C. 



A portion of 3.3863 grams was weighed out for the major part of 

 the analysis, experiment having shown that better results could be 

 obtained from portions of this size than from a larger portion of 

 about 16 grams. The nickel-iron was separated by Eggertz's method 

 of solution in iodine, the stone being found to be of too compact a nature 

 to admit of magnetic separation even if the iodine method is not to 

 be preferred in any case. The siliceous portion remaining was 

 separated into two parts in the usual manner by treatment with 

 dilute hydrochloric acid and potash. The separated portions were 

 not weighed as it was found that sufficient oxidation occurred while 

 burning off the filter to vitiate the results, but were analyzed 

 separately and their weights calculated from the analyses. The 

 insoluble portion was fused with sodium carbonate and a small 

 amount of nitre. Silica was determined after the common method. 

 Nickel and cobalt were separated from the iron by three precipita- 

 tions and long digestion with ammonia and a large excess of 

 ammonium chloride. Cobalt was separated from nickel by potassium 

 nitrite. Nickel was titrated with KCn and cobalt weighed as sul- 

 phate. Magnesium was weighed as pyrophosphate and calcium as 

 oxide after an oxalate precipitation in the usual manner. Chromium 

 was weighed as lead chromate after oxidation by bromine in acetic 

 acid solution. Phosphorus was separated by the acetate process and 

 weighed as molybdate. Water above ioo°C. was determined in a 

 separate portion by Penfield's method of direct weight. Sulphur was 

 determined in a separate portion as barium sulphate. Iron and insolu- 

 ble alumina were determined in a separate portion, the iron being tit- 

 rated by permanganate. The alumina was weighed directly, that of the 

 soluble portion as alumina, that of the insoluble portion as phosphate. 

 The alkalies were determined in a separate portion after separation 

 by platinic chloride as usual. They were found to occur wholly in 

 the insoluble portion. Ti0 2 was present in distinct although 

 unweighable quantities. A precipitate of ammonium manganese 

 phosphate also proved to be not quite large enough to weigh. A 

 search for copper gave only a very faint brownish coloration with 

 hydrogen sulphide which was not sufficient to verify. 



