14 Direcror’s Report oF THE 
In the pasteurizing room are the steam pasteurizer, milk cooler 
and Babcock tester. The upper coils over which the milk flows 
in the cooler circulate cold water and the lower ones ammonia, 
so that economical and rapid cooling is secured. The cheese 
room communicates by an elevator with the basement and with 
the second story near the cheese-curing rooms, and contains one 
large and two small cheese vats, one large constant pressure press 
and one small one. 
Upon the second floor are found a central hall and staircase as 
below and the arrangement of rooms in the east half does not 
differ from that of the first story. These rooms are, in succession 
as before, the botanist’s office, botanist’s laboratory, entomolo- 
gist’s office, entomologist’s laboratory and botanist’s museum. 
The hall between the museum and vault, however, extends 
entirely across the building to the west wall and forms part of the 
insulation of the block of cheese-curing rooms. These cheese 
rooms oceupy the west wing and are separated from its outer wall 
on all sides by a 4-foot passage-way. They are further insulated 
by double walls and air spaces on the outside and between the 
separate rooms. These rooms are six in number, each 9 by 10 
feet, and each provided over the entire wall space with shelves 14 
inches wide and 12 inches apart. It is expected to control the 
temperature in each of these rooms within 2 degrees, running 
each room independently and at any degree between 30 and 90. 
A hot-air flue from below and cold-air flue, from the chamber in 
the attic containing the expansion coils and brine tanks, lead into 
each room. ‘These flues are closed by dampers operated by com- 
pressed air and controlled by thermostats. When the tempera- 
ture falls one degree from the point fixed upon, the thermostat 
turns a valve and the compressed air opens the hot-air damper 
near the floor. Should the temperature rise, the cold-air flue in 
the ceiling is opened. So delicate is the operation of this system 
that breathing upon the thermostat will open the cold-air flue; 
fanning it, the hot-air damper. 
In front of this second story and to the right of the center are 
