SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 143, NO. 4, PLATE 3 



Martha's Vineyard, Mass., tektite photographed after am- 

 monium chloride smoking. 17.8 g. USNM 2082, X i^. B, Surface 

 opposite that shown in A. C, Photographed down deeply serrated 

 edge. 



