ILLUSTRATIONS. 
PLATE. 
CLATHRULINA ELEGANS, Cienkowsky. Eiver Roding, 
December, 16th, 1882 ........ 
FACE 
PAGE 
50 
WOODCUTS, &c. 
PAGE 
Portrait of G. S. Gibson, F.L.S. . 2 
Portrait of John Eliot Howard, E.R.S..9 
High Ongar Sand-pit in 1865 . 76 
Line of Section from Norton Heath through the High Ongar Pit, 
to the Roding ......... 82 
Diagrams of Wickham Bishop boring ..... 85 
No. 4 Denehole, Hangman’s Wood ...... 88 
Sketch-map to illustrate the geological position of the Easneye 
Park Deneholes ......... 91 
Denehole at Cavey Spring, Bexley ...... 94 
Pit near Lenham, between Birch Wood and Woodside Green . 97 
Pit in Joyden’s Wood ......... 101 
Section of Rain-band Spectroscope ...... 123 
Grace’s Spectroscope ......... 124 
Chart of the Spectrum and Rain-bands ..... 128 
