172 University of California Publications in Zoology \Vou.9 
iron frames, and rest upon either conerete or soft lead bases. 
Each aquarium is provided with an inlet pipe and bottom outlet. 
Each may therefore be used as a unit, or by plugging the outlet 
and siphoning from one aquarium to the next, serial circulation 
may be maintained. The outlet in either unit or serial arrange- 
ment leads into a concrete floor tank beneath the table. This 
tank extends the entire length of the table, but is constructed 
so that it may be partitioned into five compartments in which 
serial circulation may be maintained by allowing the water to 
flow from one compartment over the partition into the next. 
The final outlet is similar to that in the investigators’ rooms, 
the water flowing by siphons into gutters and thence out of the 
building. 
The remaining rooms need searcely more than a passing word. 
The dark-room is supplied with sink, running fresh water, elec- 
trie lights, and the usual equipment pertaining thereto, the walls 
and ceiling being black. The reagent and glassware rooms afford 
ample space for storage. They are equipped with numerous 
lockers, some with glass and some with wooden doors so arranged 
as to yield the most space compatible with convenience. The 
museum-lecture room is not yet equipped, and the library room 
is used as such only temporarily until more adequate quarters 
may be obtained. It is provided with adjustable wall shelves 
utilizing all the space not taken up by windows, the door and 
a fireplace. 
The tank for the salt-water supply to the laboratory aquaria 
is a eylindrieal structure of concrete reinforced by the so-called 
steel framework of the Kahn system. It is 16 feet 
high and 16 feet in diameter, and has a capacity of 20,000 gallons. 
? 
“high-rib’ 
It is partitioned into halves, either one of which may be used 
independently of the other. In addition to the usual outlet pipe 
the tank is provided with another to permit drainage and clean- 
ing. The tank is supported by an octagonal, two-story re- 
inforced conerete building 24 feet high, intended to house the 
pumping plant when installed. 
Great difficulty was experienced in making the tank water- 
tight. The contract was let on the assumption that the concrete 
walls would be strictly impervious. Whether from faulty design, 
