C. H. Halliday, M.D., Epidemiolgist, investigates the occurrence,
distribution and type of communicable diseases in individuals and
communities in the counties of Maryland, in order that measures for
the control of such diseases may be instituted. The Division studies
the sources and routes of infection, assists local health authorities
or family physicians in the diagnosis of communicable diseases, assists
in finding unrecognized or unreported cases and advises in regard
to the proper method for the collection of laboratory specimens. The
Chief of the Division also assists in diphtheria, tyhoid fever and
smallpox immunizations when the latter cannot be done by private
physicians or by local health officers.

C. W. G. Rohrer, M.D., Ph.D., Diagnostician, aids in the diagnosis
of communicable diseases, notably those of the exanthematous group.
He acts in an advisory capacity to medical inspectors and other physi-
cians in matters pertaining to the prevention and further spread of
such diseases. He is in charge of the Pasteur Division and admin-
isters the Pasteur treatment. He also classifies deaths by nature
and cause, recording essential data missing from original certificates.

C. H. Halliday, Chief of the Bureau of Communicable Diseases,
Baltimore.

The Bureau of Bacteriology assists physicians and health officers
in the diagnosis and prevention of communicable diseases; assists in
the prevention of maternal mortality by the examination of urine
specimens from prenatal cases; determines the bacterial quality of
drinking water, milk and other foods; examines annually many
samples of water and oysters for the protection of the public health
and the oyster industry of Maryland; tests the efficiency of operations
for the purification of water and disinfection of sewage.

The Central Laboratory is located at 2411 North Charles Street,
Baltimore City, with Branch Laboratories at Cumberland, Hurlock,
Frederick, Hagerstown and Rockville.

C. A. Perry, Sc. D., Chief Bacteriologist, Baltimore.

The Bureau of Chemistry determines the sanitary quality of
drinking waters, milk and other food substances; determines the
legality of drug products and pharmaceutical and medicinal prepara-
tions sold to the public; assists in testing the efficiency of operations
conducted for the purification of water or for the treatment of sew-
age; supplies data required in preventing the adulteration or mis-
branding of foods; conducts investigations from time to time which
have for their object the improvement of analytical methods appli-
cable to drugs, foods, waters and sewage.

Wm. F. Reindollar, SC..D., Chief Chemist, Baltimore.

The Bureau of Sanitary Engineering exercises supervision over
the purity of water throughout the State; examines all sewage and
water works projects, approves or amends them; through the State
Board of Health can require local authorities to install sewerage
or water works or to alter the construction or operation of these
works; exercises supervision over the disposal of trade wastes, stream
pollution in general and aerial pollution. It also prepares plans and
specifications and supervises the construction of water and sewerage
works at State institutions.
George L. Hall, Chief Engineer, Baltimore.

The Bureau of Foods and Drugs investigates food and drug prod-
ucts manufactured or sold in the State, for the purpose of determin-