aquatic JLitt 



11 



is required. It has a regulator, so that 

 the size of the flame can be adjusted to 

 the requirements. The flame is placed 

 about even with the heating coil. In 

 ordinary winter weather I use a flame 

 one-fourth inch high; if very cold a half- 

 rich or even more. I keep the tank cov- 

 ered with a piece of glass, which con- 

 serves the heat. 



In making the necessary joints of the 

 radiator I used, as a flux, zinc cut up in 

 dilute hydrochloric acid. While I did 

 not do so, it will be well to fill the pipes 

 with dry sand before making the various 

 bends. Otherwise, unless great care is 

 exercised, the pipe may buckle at the 

 curves and cause impeded circulation. To 

 use sand, fill the length and then close 

 each end with a pair of flat-nosed pliers, 

 or hammer shut ; bend slowly in a wide 

 circle, then snip off the ends and pour 

 out the sand. Be sure the pipe is clear 

 before preceding with the soldering — 

 blow through it. 



Heat Regulation 



When gas is used to heat an aquarium 

 the regulation of the heat becomes a 

 simple matter if a thermostat is used. It 

 may be secured from any dealer in labor- 

 atory equipment, and can readily be ad- 

 justed to the needs of the tropicai 

 aquarium. Stock patterns usually pro- 

 vide for a greater supply of gas than is 

 needed, but can be changed as desired. 

 The form illustrated herewith was de- 

 scribed several years ago by Mr. L. M. 

 Dorsey. The regulator is submerged in 

 a corner of the aquarium, and the gas 

 conducted to it from a fixture in the 

 room, then from the outlet to the burner 

 used. A few experiments will serve to 

 determine the proper height for the mer- 

 cury and the position of the gas intake 

 pipe. It will be noted that the intake 



pipe is cut at an angle, so that the rising- 

 mercury cuts off the gas gradually and 

 not suddenly, as it would if the pipe was 

 cut square. Of course, the tiny hole in 

 the tube just below the cork acts as a 

 by-pass and permits the passage of suffi- 

 cient gas to keep the burner alive. 



Mr. Dorsey has used this regulator in 

 an aquarium placed before a window dur- 



GAS INTAKE 



SMALL HOLE /NTUBE 

 TO ALLOW ESCAPEOE 

 CAS TO KEEP ElAME 

 AL/VE 



THIS PORTIOlY SUB. 

 /1ERGEP//Y WATE/Zj 

 OE AQuAfS/UAl. 



g/is oariMT . TO/UAME 

 came* 



level of /tEjecumy VAG/ES 



WITH CHAHG//YG TEfrPEFATOPE 



jhcreasz/yg o/e DEces/tsr/va 



FlOHr OF GAS. 



Aquarium Thermostat 



ing the winter months, when the room 

 temperature frequently dropped thirtv 

 degrees, yet the aquarium thermometer 

 constantly registered the 70 degrees the 

 thermostat was set to maintain. 



Jiggs — "I l ent that geologist $5, and he 

 said he'd repay it in a very short time !" 



Briggs — "He was doubtless speaking 

 stratariferously ! From pterodactyls to 

 flying machines is a very short time, to 

 a geologist !" 



Agassiz taught his pupils to kill fish by 

 a blow on the back of the head as soon as 

 they were caught, that they might not 

 suffer before dying. 



What if the good things people intend 

 to do tomorrow were only done today ? 



