226 ROCHESTER ACADEMY OF SCIENCE. 



ners which had been cut from one side by Professor Domeyko 

 in the effort to obtain a poHshed surface. 



The main portion of the exterior was covered by a thick 

 coating of melted matter, or crust, which was broken by several 

 areas, of several square inches each, where masses of almost clear 

 olivine, held but slightly together by the iron network, lay grouped 

 usually at a little lower level than the general surface. Through 

 the kind favor of Professor Domeyko, aided by a satisfactory 

 exchange, we were allowed to take the mass to the Railroad 

 ]\Iachine Shops at the port of Caldera, 40 miles away, and there 

 in several days of heavy work, cat off a piece weighing 16.7 kilo- 

 grams, or about ■^'j pounds. Plate 23 shows the two masses after 

 the cutting. The form of the entire original boloid is thus evi- 

 dent. On the upper piece (the one now in the possession of the 

 writer) the deep melting and flowing of the crust is very apparent. 

 The whole surface is not only changed in texture and blackened, 

 but it appears as if rubbed down under heavy pressure. The 

 thickness of this crust is from 0.3 to 0.5 mm., being thicker above 

 the stony than above the iron part of the mass. It is, in the main, 

 tightly adherent, but in a few places it may be flaked off. The 

 section (Plate 24, fig. i) shows it as a molten slag, or mixture of 

 metal and stone, with -the metal more settled in its lower, inner 

 surface. At some places in its thin mass there are fine points of 

 bright metal, doubtless pure nickel iron. The upper surface is of 

 a dull black color, matt, and in places having a certain bloom 

 appearance. Quite exceptional among all the pallasites with 

 which the writer is acciuainted. although approximated by 

 Marjalahti. is the thickness and firm investment of this outer 

 crust. Within, the constituents and structure of the mass are not 

 less interesting. It is a combination of nickel iron and of sihcates, 

 with the usual pallasite grouping, the iron making cells which are 

 filled bv the latter. A polished surface shows a broad, stout net- 

 work of bright iron surrounding cells which are polygonal in 

 form, with walls more angular than curved, enclosing polyhedral 

 crystals of stony matter, partly broken and the fragments some- 

 times partly separated by blades of the iron. In this feature 

 Ilimaes belongs to the Rokicky Group of Brezina, taking its place 

 with Brahin (Rokicky), Admire, and Eagle Station. In this it 



