Jacobsen, Den nordiske Kriegs Kronicke, 1675-1679 (Copenhagen, 1897); J.
Jacobsen and C. Graebe.
The first useful determinations of the dissolved gases of sea-water were made by Oskar Jacobsen in 1872.
Jacobsen on some occasions found water in the surface layers of the Baltic supersaturated with oxygen, which he ascribed to the action of the chlorophyll in vegetable plankton; in other cases when examining the nearly stagnant water from deep basins he found a deficiency of oxygen due no doubt to the withdrawal of oxygen from solution, by the respiration of the animals and by the oxidation of the deposits on the bottom.
In June 1623, however, New Netherland was formally erected into a province and the management of its affairs assigned to the Chamber of Amsterdam, which in March 1624 despatched the " New Netherland," with the first permanent colonists (thirty families mostly Walloon), under Cornelis Jacobsen Mey, the first governor or director of the colony.
Jacobsen has also obtained benzaldehyde by heating benzal chloride with glacial acetic acid: C 6 H 5 CHC1 2 +CH 3 000H =CH30001 +HC1+C6H5CHO.
C. Jacobsen VII.
Among these fresh forces three immediately took place as leaders - Jacobsen, Drachmann and Schandorph.
P. Jacobsen (q.v.; 1847-1885) Denmark was now taught to welcome the greatest artist in prose which she has ever possessed; his romance of Marie Grubbe led off the new school with a production of unexampled beauty.
But Jacobsen died young, and the work was really carriedout by his two companions.
In 1614 Cornelis Jacobsen Mey explored the lower Delaware, and two years later Cornelis Hendricksen more thoroughly explored this stream.