At the meeting of the British Association held in Birmingham in 1865, Dr. Voelker directed attention to the discovery of a bed of Phosphate of Lime in North Wales, and entered into particulars concerning its chemical composition, and economical value. same thickness and relationship to the adjoining beds. We thus infer that it was deposited in a somewhat shallow sea, not much varying in depth, or subjected to disturbing influences. The strata in which it occurs are rightly marked upon the government maps as “reversed,” dipping, as they do, away from instead of towards the adjacent Llandovery and Wenlock beds.