CONTENTS.

PAGE

1. General Report, .

2. Water Supply and Sewerage -

Report to the Legislature (under the provisions of chapter 375 of the Acts of 1888),

Advice to Cities and Towns,

Water Supply, .

Sewerage and Sewage Disposal,

. vii

1

7

9

52

Interpretation of Water Analysis, by Prof. Thos. M. Drown, Chemist of the

Board,

303

319

On the Amount of Dissolved Oxygen in the Water of Ponds and Reservoirs

at Different Depths in Winter, under the Ice, by Prof. Thos. M. Drown,

Chemist of the Board,

333

On the Mineral Contents of Some Natural Waters in Massachusetts, by Prof.

Thos. M. Drown, Chemist of the Board,

A Study of Odors observed in the Drinking Waters of Massachusetts, by

Gary N. Calkins, Assistant Biologist,

Seasonal Distribution of Microscopic Organisms in Surface Waters, by Gary

N. Calkins, Assistant Biologist,

Experiments upon the Purification of Sewage at the Lawrence Experiment

Station, by Allen Hazen, Chemist in Charge, .

393

Experiments at the Lawrence Experiment Station upon the Purification of

Water by Sand Filtration, by George W. Fuller, Biologist at the Station,

Some Physical Properties of Sands and Gravels with Special Reference to

Their Use in Filtration, by Allen Hazen, Chemist in Charge,

Sewage Disposal of Cities and Towns in Massachusetts by Intermittent Fil-

tration,

3. Report upon Artificial Ice made in Massachusetts,

4. Report upon Food and Drug Inspection,

Report of Dr. C. P. Worcester, Analyst,

Report of Prof. C. A. Goessmann, Analyst,.

5. The Weekly Mortality Reports of Massachusetts Cities and Towns,

-

6. Reports upon Epidemics of Typhoid Fever in Massachusetts in 1892, -
On Epidemics of Typhoid Fever in the Cities of Lowell and Lawrence, with Obser-
vations upon its Existence in Other Cities of the Merrimack Valley, especially in
Newburyport, by Prof. W. T. Sedgwick,

On an Epidemic of Typhoid Fever in the Village of Chicopee Falls, apparently due

to Infected Drinking Water, by G. V. McLauthlin, with a Prefatory Note by Prof.

W. T. Sedgwick,.

On an Epidemic of Typhoid Fever in the City of Springfield, apparently due to

Infected Milk, by Prof. W. T. Sedgwick and W. H. Chapin, M.D.,

On an Epidemic of Typhoid Fever in the City of Somerville, apparently due to

Infected Milk, by Prof. W. T. Sedgwick, .

On Epidemics of Typhoid Fever in the Villages of Bondsville, Provincetown and

Millville, apparently due to Secondary Infection, by Prof. W. T. Sedgwick,

7. Health of Towns,