12 Drrecror’s REPoRT OF THE 
out running the machinery. The power for the compressor and 
other machinery is furnished by a Straight Line, high speed, cen- 
ter crank horizontal engine which, at a steam pressure of 70 
pounds and speed of 260 revolutions, gives about 25-horse power. 
In refrigeration the gaseous ammonia is drawn from the expan- 
sion coils and passes through the water-jacketed compression cylin- 
der where it is liquefied by a pressure of from 150 to 200 pounds. 
On its way to the cooling coils and tank the liquefied ammonia 
passes through a long, slender cylinder where by the action of 
gravity, it is freed from the oil used in lubricating the compressor. 
In the coils of the condenser the heat is drawn from the ammonia 
until the latter reaches the temperature of the city water sur-_ 
rounding the coils. From the cooling tank the liquid passes to 
the expansion coils as required, and by its rapid evaporation, con- 
trolled by expansion valves, withdraws the heat from the air or 
the brine surrounding the coils. The temperature can be reduced 
to a point far below freezing. 
Departments and their equipment.— Handsome oak and glass 
doors lead into the entry from the front and from the entry into 
a central hall and staircase. Occupying the left side of the main 
building and the east wing are the five rooms devoted to horticul- 
ture. These consist, in succession from the entrance and all com- 
municating, of the horticulturist’s office, 18 by 15 feet, with a 
large dark closet attached; horticulturist’s laboratory, 20 by 14 
feet; assistant horticulturists’ office, 20 by 174 feet; assistant hor- 
ticulturists’ laboratory, 82 by 141-3 feet; and museum, 32 by 
14 2-3 feet. The offices here, as throughout the building, are 
provided with large roll-top desks, revolving bookcases, specially 
planned and commodious wall cases and comfortable desk and 
office chairs, all the furniture being of oak. The laboratories 
each have a large work-table, with Alberene stone top and sink, 
fitted with the conveniences previously mentioned. The win- 
dows are provided with wide microscope tables or shelves, and 
these as well as the projecting ledges of the microscope and 
