86 REPORTS ON INVESTIGATIONS AND PROJECTS. 



the basement of the laboratory by a door of refrigerator construction. Each 

 room contains two or three large tanks about 4 by 4 feet for fishes ; two of 

 the rooms contain a series of smaller tanks elevated 3 feet above the floor, 

 for smaller aquatic animals, such as Crustacea. The bottom of each of the 

 smaller tanks is sloping, affording a variable depth of water. Constantly 

 running water from a flowing artesian well enters each compartment through 

 ebonite cocks, and the overflow runs into the sand and gravel that forms the 

 floor of the cave. No outlet pipe is possible, because the floor of the cave is 

 below the level of high tide; the natural soil forms a dam to the influx of 

 sea-water. After the concrete tanks were made it was found necessary to 

 heat them and infiltrate with paraffine to prevent the formation of a limy 

 acid that was fatal to the organisms. A shelf running above the tanks on 

 one side affords room for jars containing terrestrial organisms. The cave 

 is ventilated at each end and is provided with electric bulbs of ruby glass and 

 also of clear glass. The cave opens into a dark basement room which has 

 been provided with apparatus to test the light reaction of organisms. 



In the early part of the fiscal year a chemical room was fitted up by parti- 

 tioning off a portion of the north room on the first floor. All woodwork 

 except the window trim was sheathed with asbestos board. A chemical table 

 and hood were put in place. A gasolene gas-machine was installed, supply- 

 ing not only the chemical room but also the six incubators, and is available 

 for all the investigator's rooms. 



Among other things a concrete wall 16 feet long was put up to hold back 

 enough salt-water in the pond to make it possible to pump at any state of 

 tide and to use in case of fire. 



MAINTENANCE. 



Pipes were reset in the greenhouse and the floor partly concreted; the 

 wooden stable-floor was replaced by concrete, the hay-mow remodeled, sun- 

 dry cases and trap-nests manufactured as required, and the lawns and paths 

 maintained in fair order. 



