ILLUSTRATIONS.
PLATE.
PAGE
CLATHRULINA ELEGANS, Cienkowsky. River Roding,
December, 16th, 1882........ 50
WOODCUTS, &c.
PAGE
Portrait of G. S. Gibson, F.L.S........ 2
Portrait of John Eliot Howard, F.E.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 Bain-band Spectroscope....... 123
Grace's Spectroscope....... 124
Chart of the Spectrum and Bain-bands..... 128