392 BULLETIN OF THE BUREAU OK FISHERIES. 



the reservoir) and the 8-inch "pond supply" (through which water returns from the 

 reservoir to the ponds below the railroad) pass through the same culvert beneath the 

 railway tracks, and are therefore parallel and closely approximated for a short distance. 

 A little south of the railroad, a crossover connects the two lines, as may be seen in the 

 foreground of figure 7, plate lxxviii. There is a valve in the crossover which is ordi- 

 narily closed, so that the two lines function quite distinctly. It is possible, however, to 

 open this valve and at the same time to close a valve in the reservoir supply line just 

 above the crossover. If the pumps are then set in operation, the water passes through 

 the 14-inch portion of the reservoir line as far as the crossover, where it turns into the 

 pond supply and its various branches, and will even flow into the lower end of the 

 reservoir unless the valve controlling the normal outlet from the reservoir be closed. 

 Again, if for any reason it becomes necessary to operate both pumps at the same time 

 and thus to force an unusually large volume of water through the reservoir supply line, 

 the friction head may be substantially lowered, by leaving open all valves in connection 

 with the crossover. The discharge through the 14-inch pipe then divides into several 

 streams, passing through (a) the lo-inch continuation of the reservoir line, (6) the 8-inch 

 pond supply, and (c) the 4-inch "A-B branch." In this case the water may be per- 

 mitted to enter the reservoir at both ends, that is, through the normal outlet as well as 

 through the inlet. 



The plans of drains and sewers are shown in text figures 7 and 8. All sewers from 

 buildings north of the railroad and the drains from the reservoirs, cisterns, and upper 

 tiers of ponds, converge into a main 12-inch line, which discharges into a storm chan- 

 nel in the eastern part of the grounds. Through this storm channel the waste water 

 passes into the river some distance below the intake for the pumps. 



OTHER EQUIPMENT. 



At the present time the station owns two launches, one of which is kept on Lake 

 Pepin, Minn., at a considerable distance from the station (pi. Lxxix, fig. 11), the other 

 being regularly used at Fairport. There are also three small power flatboats employed 

 in invesfigations and in fishing operations and a number of small rowboats both at 

 the station and in the field. 



The original temporary laboratory has been equipped with a battery of hatching 

 jars which may be used for experimental purposes or for practical hatching operations, 

 as opportunities and necessities arise. 



It is unnecessary in this place to mention in detail the scientific apparatus such as 

 is ordinarily found in a biological laboratory, or to refer to the various field and me- 

 chanical tools that are necessary for the maintenance of an institution of this size loca- 

 ted at a distance from an important town. 



Mention should be made, however, of the fact that the station has a complete outfit 

 of simple button-making machinery of the old type, by means of which commercial 

 tests of shells can be made by cutting and finishing buttons or novelties. The machin- 

 ery is that which was formerly used by the late J. F. Boepple, who founded the fresh- 

 water pearl button industry. The shell-testing shop is the small building seen at the 

 extreme left of figure 3 (pi. Lxxvii), being designated on the map as the temporary 

 pump house. 



