Delta Works was completed by the Europoortkering which required the construction of the Maeslantkering in the Nieuwe Waterweg between Maassluis and Hoek van Holland and the Hartelkering in the Hartel Canal near Spijkenisse. The works were declared finished after almost forty years in 1997. In reality the works were finished on 24 August 2010 with the official opening of the last strengthened and raised retaining wall near the city of Harlingen, Netherlands. Due to climate change and relative sea-level rise, the dikes will eventually have to be made higher and wider. This is a long term uphill battle against the sea. The
An essay on the classification of the parasitic Hymenoptera of Britain which correspond with the Ichneumones minuti of Linnaeus authors who have treated of the family at large are enumerated and noticed in detail by Professor Gravenhorst, in the Prolegomena to his History of European Ichneumones. It was not till the year 1811 that this supplemental branch was distinguished from the proper Ichneumones, by Doctor Nees von Essenbeck, whose system is more fully unfolded in the ninth volume of the New Series of Transactions, published by the Imperial Academy of the Physical Sciences, and has been followed by modern entomologists with few exceptions . That of Spinola, which Latreille adopted, and has adhered to in his latest works, differs