Dr. Lathrop’s account of the springs and wells in Boston. 59 
The strata, as nearly as I could ascertain, are the following. 
1, Mould and yellow earth : : : é 
2. Yellow earth with sand ; . . 
3. Yellow sand with small stones, slate and quartz 
A. Fine gray sand . ‘ ; 
5. Gray sand of a coarser sort, with _—_ stones 
6. Fine, soft, yellow sand .. ; 
tn (RRO. Kee ror 
oO O10 OF aE 
7. Gray sand with slate and quartz 
8. Blue clay, with small stones of the same colour, oe very 
little variation . 63 0 
_ 9. Indurated clay, with larger stones, of the dee kind chief 
iy one with ferruginous veins, and an incrustation of 
calcareous matter, which effervesces with an acid RS, 
10. A mixture of clay and gravel and water, with smooth 
stones, like those commonly found on the sea shore, and 
appear as if rubbed against cach other irs 2.0 
96 0 
‘No ss A was sit in any of the strata, an, the workmcp en- 
tered on the last. After digging a foot, or a foot and a halt, in the last 
stratum, the bottom became so soft, and the water came in so fast, 
that the workmen were obliged to desist. The well was stoned and 
finished. 
_. Having ites informed, that the depth of water was different at dif-. 
ferent times, I determined, if possible, to ascertain the fact, and satisfy 
myself whether the ebb and flow agreed with the ebbing and flowing 
of the sea. On the tenth of October, 1797, at low water I measured 
and found 7 feet and 11 inches. ‘The next day at high water I meas- 
ured, and found 8 feet and 11 inches; difference one foot. On the 
twelfth, of July, 1798, at high water, and on the day before the change 
\ 
