400 H. L. Preston — Notes on the Kansas Meteorite. 



In Experiments V, VI, VII, this mode of working was put to 

 the proof. The amounts of rubidium indicated were dissolved 

 in the form of the chloride in water, 0*1 grm. of potassium 

 chloride was added, and the solution was evaporated and 

 treated as described. 



Rubidium taken Potassium taken 



in the form of 

 chloride. 



in the form of 

 chloride. 



Rubidium 

 found. 



Absolute 

 error. 



Percentage 

 error. 



V. 1 mg. 



VI. 2 " 



VII. 1 " 



0*1 grm. 

 0-1 " 

 0-1 " 



0-8 mg. 

 1-7 " 



0-9 " 



0-2 mg. 

 0'3 " 



o-i " 



20 per cent. 

 15 per cent, 

 10 per cent, 



The error of the process is manifestly large, and only 

 roughly approximate results can be hoped for when large 

 amounts of rubidium are dealt with ; but, if the question is 

 the estimation of only a few milligrams of rubidium, it will 

 appear, we think, in view of the fact that the only alternative 

 is an indirect process, that even this great error is not abso- 

 lutely prohibitive of what may be called fair determinations. 



XLIX. — Notes on the Farmington, Washington Comity, Kan- 

 sas, Meteorite', by H. L. Preston. 



Professor Henry A. "Ward has just cut several slices 

 from his 136J-pound Farmington meteorite, which have un- 

 veiled some interesting facts. 



In appearance the slices resemble a section of a dark gray 

 conglomerate (in color much like some trap rocks) with numer- 

 ous small patches or grains of iron scattered through it, the 

 largest of which is llx6 mm in its greatest diameters. 



In the corner of three of these slices there are several veins 

 or fissures extending from 10 to 75 mm from the edge of the 

 slice toward the center; and some of these fissures or fractures 

 are filled with iron for 65 mm in length from the edge of the 

 slice inward, while in width they are but one millimeter or less. 



On the opposite end of the slice there is a very narrow 

 vein, about 90 mm long, which for the greater part of the 

 way is filled with iron. Beyond the larger grain or nodule 

 spoken of and these veins, the balance of the iron is scattered 

 rather evenly throughout the mass in comparatively small 

 grains. 



For the origin of these fissures and their partial filling up 

 with iron, as seen in the accompanying cut, I would suggest 

 the following explanation : 



