LIST OF ILLUSTRATIONS. 
7 
Fig. io. — Exaggerated Conical Shape, showing long 
Fracture Facets At end 
Fig. ii.- -Normal Conical Shape, showing long Fracture 
Facets „ 
Fig. 12. — Highly glazed Conical Shapes, showing little 
trace of Fracture Facets, probably caused by the 
bubble bursting high in the atmosphere and the 
consequent air friction causing excessive fusion of 
the surface „ 
Fig. 13. — Oval I ,cns Shape, showing sharp Longitudinal 
Curve 
Fig. 14. Lens Dumb-bell, showing Longitudinal 
Curve 
Fig. 15. — -Flat Conical Dumb-bell, showing Longitudi- 
nal Curve ,, 
Fig. 16.- — Deep Conical Dumb-bell, showing long 
Fracture Facets and Longitudinal Curve „ 
Fig. 17. Dumb-bell that has evidently been in a fire 
and exhibits the chipping of the surface caused 
by sudden heating „ 
Fig. 18. Large Dumb-bell, showing very slight 
Longitudinal Curve ,, 
Plate XXI . 
Figs. 1, 2, 3, and 4. — Billitonites „ 
Figs. 5 and 6.- Jrregular Moldavites ,, 
Figs. 7 and 8. — Different Aspects of one Moldavite, 
showing Tendency to Regularity of Form ,, 
Plate XXII. 
Fig. 1. — Bubble reconstructed from Button, after 
Dunn >. 
Fig. 2.- Ditto from Lens Button 
Fig. 3. — Ditto from Lens Dumb-bell 
Fig. 4. — Ditto from Conical W. A. Form ,, 
Plate XXIII. 
Figs. 1 and 2. — Maclaurin’s Spheroids „ 
Figs. 3 and 4. — Jacobi’s Ellipsoid ,, 
Fig. 5,- — Planetary Form coalescent with Elongated ,, 
Form, just stable >> 
Fig. 6. — Flat Unstable Form ,, 
Fig. 7.— Limiting Maclaurin’s Figure ,, 
Fig. 8. — Poincare’s Figure >> 
Figs. 9 and 10. — Hour-glass Figure of Equilibrium. . . ,, 
