Primrose Hill was purchased by the Crown from Eton College early in the present century as a public resort, and it now rises from the midst of fifty acres of land laid out as a park to the north of Regent's Park. The summit is 206 feet above the Trinity high-water mark of the Thames, and it commands an extensive view of the Metropolis. The London and North-Western Railway constructed a tunnel under the Hill more than sixty ears ago, which was thought a great engineering feat at that time and for long afterwards. On the southern slope, in 1864, Phelps, the actor, planted an oak to commemorate the Shakespeare tercentenary. Primrose Hill is much frequented on Bank Holidays, and when toboganning is to be had.
source: The Queen's London : a Pictorial and Descriptive Record of the Streets, Buildings, Parks and Scenery of the Great Metropolis, 1896