All Illustrations
The Snarling Horde Below 
How He Strained and Panted 
He Stared on a Staring Horse 
Wild and Shy and Monstrous Creatures 
Surrounded by Giant Toads 
Metropolitan Railway at Clerkenwell Tunnel 
Brunton Boring Machine 
Beaumont Boring Machine 
Diamond Drilling Machine 
Ferroux's Boring Machine 
Tunnel Boring Machine in Action 
London Underground
