AKT. 18. SOME RECENTLY FOUND METEORIC IRONS MERRILL. 3 



uniform thickness throughout or again swollen, as is shown in the 

 plate. Plessite areas are abundant and large, varying in size up to 

 10 mm. in diameter. No troilite nodules are visible on the cut sur- 

 face, and no schreibersite. The taenite is visible on the etched sur- 

 face only in the usual disconnected thin films. 



The striking feature of the iron lies in the varied orientation of the 

 crystal plates in the center and two end portions of the mass (see pis. 

 2 and 3). It will be noted that in this central portion {D) the kama- 

 cite plates are for the most part thin, closely crowded, and lie nearly 

 horizontally (in the figure). To the left they become separated and 

 the structure becomes more nearly that of a normal octahedrite. On 

 the right, however, along the somewhat wavy line A-B^ they abut 

 against a single disconnected row of plates extending nearly vertical 

 and are no longer continuous throughout the remaining portion of 

 the mass to the right. Nor are the vertical and diagonal plates C 

 and E in the two portions quite parallel with one another, and there 

 is a slight difi'erence in manner of etching and in the relative thick- 

 ness of the kamacite bands in the two portions. This last is most 

 plainly noticeable in the lower part of plate 3. What portion of 

 these differences may be due to the angle of cutting, the Avriter is 

 not at present prepared to say; the appearance is certainly such as 

 to suggest the welding of two quite similar irons along this line 

 rather than twinning after the manner of the Mukerop, as is de- 

 scribed by Berwerth. 



Chemical analysis by Whitfield yielded : 



Per cent. 



Iron 83. 621 



Nickel 7. 762 



Cobalt . 333 



Phosphorus • 130 



Sulphur .0.'>8 



Chlorine • 107 



Carbon . 475 



Silicon None. 



Manganese None. 



Copper yow. 



^Metallic oxides •'»• ^^^ 



Water 1- 290 



Insoluble • 346 



100. 017 



The 5.895 per cent metallic oxides yielded ferric oxide (Fe,0,), 

 4.995 per cent; nickel and cobalt oxides (XiO-CoO), 0.9-i per cent. 

 The 0.346 per cent insoluble yielded 0.242 per cent iron. A " direct " 

 determination gave 87.802 per cent total iron. This is a little below 

 the average for a coarse octahedrite, though, as usual, this is com- 



