Portland Cement
a cement havsupposed to have been formerly an is- PORTLAND, ISLE OF, a peninsula, land, in the county of Dorset, 50 miles Channel. It is attached to the main- Channel. It is attached to the mainof the well-known Portland stone, which land by a long ridge of shingle, called of the well-known Portland stone, which ported in lar is chiefly worked by convicts, and is exlarge quantities. One of the most prominent objects in the island is the convict prison, situated on the top land is called the Bill of Portland, and of a hill. The extremity of the isbetween it and a bank called the Shambles is a dangerous current called the Race of Portland. pal port of the British colony of Mauritius; on an excellent harbor on the