Christchurch and Lyttelton Railway Tunnel.

The tunnel works of the Christchurch and Lyttelton railway having advanced so rapidly that only a few chains towards the centre were yet to be pierced, I continued to examine carefully the highly interesting section thus offered, and sent a copy of that geological survey, a section drawn at a scale of 20 feet to 1 inch, together with about 200 geological specimens in illustration, to the Paris Exhibition of 1867.