8 
MUSEUM BULLETIN NO. IS. 
striking similarity between the two. They both exhibit a 
microgranular groundmass broken by a series of fine pittmgs 
and it is only in the relative size of these pittings that they 
exhibit any apparent structural variation ; but it must be remem- 
bered that this variation in the dominant character of the two 
meteorites is in the main not greater than the variations to be 
observed in the character of different parts of either one of 
them. 
All of these factors which have just been noted together 
with the very probable coincidence in point of geologic age point 
strongly to the probability that these irons are relics of a single 
meteoric shower which took place back in Tertiary time. 
