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Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. The art of waterproofing, while having passed its infancy, is not yet in its adult stage, of development. That it has developed from a crude understanding and practice is evident from the fact that the ancient Romans would waterproof their structures by building foundation walls so thick that water could not possibly percolate through them.