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THE 



AQUARIUM 



for the fish is far in excess of the supply, 

 a fact that may be emphasized by stat- 

 ing that Japan sells more than half a 

 million dollars of them annually. Dr. 

 Smith says that in order to convey some 

 idea of the actual relative values of the 

 different varieties of goldfish, the fol- 

 lowing average wholesale prices per 

 1,000 fish are taken from the operations 

 of a Tokyo breeder a few years ago: 

 Demekin, 1 year old, $10; Wakin, 8 

 years old, $22.50; Ryukin, 3 years old, 

 $100.00; Oranda shishigashira, 5 years 

 old, $750.00; Ranchu, 2 years old, 

 $75.00; Ranchu, 5 years old, $2,500. 

 Sometimes single pairs of fancy varie- 

 ties fetch wonderful prices — from fifty 

 to seventy-five dollars, for example. 



The breeding of goldfish is full of in- 

 terest, not particularly difficult for in- 

 telligent people, and any old farm with 

 water on it (in ponds, etc.), in any part 

 of the United States, is available for the 

 purpose. The management of goldfish 

 aquaria is by no means an unimportant 

 subject, but its treatment does not prop- 

 erly fall within the scope of the present 

 article. 



Heat Regulation 



By L. M. DORSKV 



The article presenting various meth- 

 ods of heating recently illustrated in 

 this magazine leads the writer to oifer 

 a method of automatic control of tem- 

 perature where a gas flame is the heat- 

 ing medium. 



The heat regulator or "thermostat," 

 as it is called, is to be had in various 

 forms of any dealer in laboratory equip- 

 ment, and with slight modification can 

 be adjusted to the needs of the aquarisl. 



The trouble with most of those of 



stock pattern is that they are set to allow 

 a much greater flow of gas than is ever 

 necessary to maintain the proper G~) or 

 TO degrees of the aquarium. 



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The accompanying illustration is self- 

 explanatory. The apparatus will greatly 

 repay those taking the pains of installa- 

 tion, for once properly established it will 

 relieve the aquarist of all concern re- 

 garding the important essential of tem- 

 perature. 



Last winter I had two aquaria under 

 control by this method — one beside a 

 window in my sleeping room which was 

 always kept cold at night, the tempera- 

 ture frequently dropping 30 degrees and 

 more, yet the thermometer continually 

 registered the 70 degrees tbat it was set 

 to maintain and remained in satisfactory 

 service throughout the entire winter. 



Concluded from page 8i 



fish spawned as far as we could see ; 

 however, as the brook was not put in 

 operation until about the middle of June, 

 we hope that an earlier start will l)ring 

 us better success next year. 



