Having lately read some interesting remarks on the well-known green-coated flints of Kent in the Geological Magazine, I am induced to offer you the following notes.

During the summer of 1864 I investigated many parts of Bulgaria, but more especially the Dobrudscha, where the sagacious observations of Capt. T. Spratt, R.N., F.R.S., frequently served me as guides. In the highly interesting Cretaceous strata at Kanara, near Küstendsche, which had been correctly identified by Capt, Spratt as Chalk, and from which Professor Reuss lately described many Foraminiferœ I discovered a pseudomorphous substance, which replaces the flint at many points along the coast, and in the Kara-Suvalley.