476 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.59. 



EXPLANATION OF PLATES. 



Plate 100. 



Upper. — The anterior view of the larger fragment of the Troup meteorite. About 



three-fourths natural size. 

 Lower. — The posterior side of the larger fragment of the Troup meteorite. About 



three-fourths natural size. 



Plate 101. 



Polished cross section of the Troup meteorite. The larger iron grains are the lightest 

 spots. Several chondri appear, the largest near the left-hand corner. The dark 

 blotches are due to oxidation of the iron immediately after polishing. A vein runs 

 a sinuous course parallel to the lower margin. Magnified to twice the diameter of 

 the stone. 



