Abstract
Specimens of remarkable deposits which have formed in the water-boxes of coal-mines in the neighbourhood of Newcastle-upon-Tyne have been for many years in the possession of the Museum of the Durham College of Science. A rough analysis has been published by J. T. Dunn (‘Transactions of the Newcastle Chemical Society,’ vol. 3, p. 261) of an apparently similar deposit, which was formed daring the autumn of 1876 in the Jane Pit at Walker. During this short period the sectional area of the box had been reduced by the deposit from seven and a half square inches to less than half a square inch, and had been in places almost completely closed.

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