138 Transactions. 
is due to the deposit of fine silt in the pores of the rock, or to a micro- 
scopic growth of plant-life, or to a gelatinous deposit of iron, has not been 
etermined ; but the withdrawal of solids in solution and suspension in 
the water is sufficient cause to account for a large diminution of flow 
in a given area, even though the quantity of water has not apparently 
diminished. The putting-down of a large number of wells naturally leaves 
spaces where formerly was a water-channel full of water. The spaces 
increase as every bore is driven into the water-basin. A well put down 
blue sand in a discoloured water. In the course of a day or two the 
street in the vicinity of the well was covered with sand. The cause 
being discovered, the pipe was driven to a depth of 196 ft., when the 
sand ceased. More than 110 loads of sand were carted away from about 
the well, and certainly it did not represent one-half the quantity brought 
up. It can be understood what the effect the withdrawal of so much 
sand must have upon the adjacent overlying beds. The pressure would 
in the course of time bring about creeps, and the well, which cost 
arse £300 to put down, was soon after abandoned, it having become 
choked. 
to a depth of 743 ft., and Robjohns and Co. went down 753 ft. in the 
hope of striking water, but both were unsuccessful. The deepest flowing 
well in Napier is 404 ft. The flow is excellent, and when water was 
struck it rose 26 ft. or more above the surface. In this same well a 
the different wells, on account of imperfect reticulation. The wells put 
down along Munro Street indicate the general dip of the underlying beds, 
and act as a guide to the tilt of the water-bearing bed in the vicinity of 
Napier. Thus, in Munro Street, 24 chains from the foot of the hills is à 
street towards the south by east, and no doubt the deepest wells will be 
found near the railway at the corner of George's Drive. . 
The wells put down in Nelson Park, and subsequently in McLean Park, 
appear to have seriously interfered with the flow of the smaller private 
wells in I immediate neighbourhood, and some of the latter have even 
. 
