was formed in 1708 by amalgamation, and entitled the "United Company of Merchants of England, trading to the East Indies". St Helena was then transferred to this new United East India Company. The same year, extensive work began to build the present Castle. Because of a lack of cement, mud was used as the mortar for many buildings, most of which had deteriorated into a state of ruin. In a search for lime on the island, a soldier in 1709 claimed to have discovered gold and silver deposits in Breakneck Valley. For a short period, it is believed that almost every able-bodied man was employed in prospecting for these precious metals. The short-lived Breakneck Valley Gold Rush ended with the results of an assay of the deposits in London, showing that they were iron pyrites. A census in 1723 showed that out of a total population 1,110, some 610 were slaves. In 1731, a majority of tenant planters successfully petitioned governor Edward Byfield (1727–1731) for the reduction of the goat population. The next governor, Isaac Pyke (1731–1738), had a tyrannical reputation but successfully extended tree plantations, improved fortifications and transformed the garrison and militia into a reliable force for the first time. In 1733 Green Tipped Bourbon Coffee seeds were brought from the coffee port of Mocha in Yemen, on a Company ship The Houghton and were planted at various locations around the Island where the plants flourished, despite general neglect. Robert Jenkins, of "Jenkins' Ear" fame (governor 1740–1742) embarked on a programme of eliminating corruption and improving the defences. The island's first hospital was built on its present site in 1742. Governor Charles Hutchinson (1747–1764) tackled the neglect of crops and livestock and also brought the laws of the island closer to those in England. Nevertheless, racial discrimination continued and it was not until 1787 that the black population were allowed to give evidence against whites. In 1758 three French warships were seen lying off the island in wait for the Company's India fleet. In an inconclusive battle, these were engaged by warships from the Company's China fleet. Nevil Maskelyne and Robert Waddington set up an observatory in 1761 to observe the transit of Venus, following a suggestion first made by Halley. In the event, observations were obscured by cloud. Most of the cattle were destroyed this year through an unidentified sickness. In the peak era, a thousands ships