( 744 ) 



0.30M. -[- A. P. The I)oriii,u-liolo, alllioii.uli slill in llic diiiios, hoiiig 

 (•oiii()iinili\cl_v low, tlio Wilier rose licro al)u\o (he <i,r(mii(l. The fact 

 that Ihose tuur wells are situated iji the dunes, lt>gellier with llieir 

 comparative distances from the lower regioJis, distinctly make their 

 influence felt here. 



Nearer to the inland dunes, the level of the water is every- 

 where lower than in the middle. On ihe I P'> of April 1903, in 

 the Koningsduin near Castricum, the level of the water in two 

 wells, sunk down to 32 M. ".A. P., was 1.11)5 and 1.23 M. -|- A.P. 

 They were at a distance of about ' /.^ K.Al. from each other and 

 they were 74 J^- j^^- from the low-lying land; the distance from 

 the sea being- 27-, K. lAI. On the same day tlie level of the water 

 was 0.29 M. -1-A.P., in a well, deep 33 M. ^ A.P., near Sant- 

 j)00rt, at the inland of the <hnies and 2200 M. from the Zuid- 

 Spaarndani ])older (the level of the superficial water or the Summer 

 Level here being 2.60 M. ! A. P.), whei-eas it reached no higher 

 level than 0.055 M.-|-A.P. at Rosenstein, separated fr<»in ihe dunes 

 by the plain of Driehuis, and o]dy 1300 M. tVoni the Noord-S[)aarn- 

 dani polder, (of the same depth as the polder of Zuid-Spaanidam). 



Just as in the Krouwerskolkje near Overveen, the water i-ises 

 above the boring-hole also near Bergen, on the grounds of the 

 Alkmaar waterworks, in wells, oidy about 20 M. '. A. P. deep, 

 for the reason of the dunes having purposely been lowered. Mere 

 however, in the midst of high dunes and at ■*/,, K. M. from rather 

 shallow |)olders (summer-level -- 1.33M.), it rose to a level of 1.35 M. 

 + A.P., (.n March 1^^ 1903. 



In a well, deep 40 M.'. A. P., on the grounds of the [)aper-manufactory 

 of the lirm van Gkldkr & Sons, at Velsen, which well is situated at 

 1300 M. from the Noord- en Zuidwijkermeer ])olders (having 2.40 M. 

 "f- A.P. Summer-Level) the water on A|)ril 14^'' 1903, had a level 

 of 0.26 M. -|- A. P. without, for 53 hours, there having been any 

 pumping, neither there nor at any of the other wells. Under meteor- 

 ological conditions which admit of comparison, a well, deep 44 M. 

 -r A. P., near the small steam-mill, in the Meerweiden, on the Nortli- 

 Sea Canal, had a level of 0.435 M. i A. P., it being situated 

 only 370 M. from those polders and between two shallower ones 

 (-^ 0.50 and r 1.40 M. Summer-Level). In the Zuidwijkermeer- 

 tbrt, situated in the })older of the same name, a well, 45 M. ^ A.P. 

 deep, had on March 8^'' 1902 a level of about 0.80 M. -r A.P. 

 Here we distinctly see the lowering of the level of the water in 

 deep wells, from the dunes to the polders, which shows a horizontal 

 motion in that direction. 



