1866. ] Mr. Waldie on the water of the Hooghly, &c. 203 
fig. 4, 4a. They occur in a thin-bedded, dark-grey, argillaceous 
limestone, having in some places the appearance of a calcareous 
slate. But beds of Weean limestone must exist not far from Sono 
Murg and form propably some of the beds of limestone which are 
seen in the high valley between the Ambernath and the Gwashbrari, 
as blocks of limestone of this description, rounded by running water, 
were found in the bed of the Sind, near the traveller’s home at 
Sono Murg. 
To be continued. 
EXPERIMENTAL INVESTIGATIONS connected with the supply of watTER 
from the Hooghly to Caucutta, by Davip Waupin, sq. F.C. S. dc. 
[Received 31st August, 1866. | 
The attention which of late years has been given amongst civilized 
communities to the preservation of health and prevention of disease, 
has naturally been directed amongst other subjects to that of the 
water employed for economical purposes, and more particularly to its 
purity and wholesomeness asa beverage and as the medium for the 
preparation of food. The subject has been under the consideration 
of the municipal authorities of Calcutta, who, as is well known, have 
organised a scheme for the supply of the town from the river Hooghly, 
for the carrying out of which arrangements are now in progress. 
The Sanitary Commission appointed some time ago in the Bengal 
Presidency, and I believe in the other Presidencies also, recommended 
to the several governments of the Subdivisions, that the water of the 
various cantonments and stations should be subjected to chemical 
analysis for the purpose of ascertaining their wholesomeness, and 
these recommendations are in course of being carried out. 
In England, and more particularly in the metropolis, much attention 
has been given to the same subject, and also to another one closely 
connected with it, namely, the disposal of the sewerage of towns. This 
subject is connected with that of water supply, not only, because in 
the plan generally followed for getting rid of sewerage in towns, a large 
