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THE 



AQUARIUM 



67 



months, when it was most active; in the 

 winter months less than one pound per 

 week sufficed. 



Much has been said by aquarists 

 about the food of the white-fish under 

 these conditions. We have kept white- 

 fish in aquaria tanks for over three 

 years; this, I think, is the record. We 

 have tried to induce them to take five 

 minnows, yet I have never seen any of 

 them take one, or even attempt to catch 

 one. I have known this species to live 

 in aquaria for 

 six months 

 without taking 

 any food at all. 

 Later we in- 

 duced them to 

 take raw beef. 



I believe that 

 the Sea Horse 

 attracts more 

 attention from 

 the visitors than 

 any other spe- 

 cies we exhibit. 



The aquarium 

 was built by the 

 city of Detroit, 

 at a cost of 

 about $115,- 

 000.00; the cost of maintenance is about 

 $11,500.00 annually. It was opened to 

 the pubHc August 18, 1904, and is open 

 to visitors every day in the year. Since 

 the opening day, 6,857,874 persons have 

 visited it, an average of 2,341 per day. 

 These figures prove without a doubt 

 that it is the most pouplar institution 

 in the city. 



In conclusion I may say that I am at 

 a loss to know why more cities do not 

 establish aquariums. In my opinion the 

 result in advertising a city and furnish- 



ing instruction to the people is most 

 invaluable. 



ATTENDANTS' PASSAC,l{-A(jrA R I TM 



Useful Receipts 



By CHAS. VON EFF, Brooklyn. 



The following cements I have used, 

 and know to be exceptionally good. 

 If properly made and applied they will 

 never leak a drop. Formula No. 1 

 should be applied while quite warm so 

 that it will thoroughly take hold of 

 both frame and glass; in fact, it is good 

 policy to warm 

 glass and frame 

 before cement- 

 ing. 



Cement No. 1 

 — 1 oz. boiled 

 linseed oil; 4ozs. 

 hard black tar; 

 1 oz. tallow; 1 

 lb. resin. Mix 

 well and heat 

 only enough to 

 melt thoroughly. 

 In making up 

 cement No. 2 , 

 heat the oil and 

 dissolve the res- 

 i n in it ; then 

 mix in the other 

 ingredients and work thoroughly. When 

 the mixture has attained a sticky con- 

 dition mix in enough glazier's putty to 

 make possible cleanly handling. This 

 cement must be kept warm until used, 

 and should not be mixed up until you 

 are ready for it, as it sets in an hour 

 or two. When this cement is carefully 

 mixed and properly used it is the most 

 satisfactory cement known. 



Cement No. 2. — 8 ozs. litharge; 6 

 ozs. plaster Paris; () ozs. Portland ce- 



(_Co)ifinuid oil Page ^2) 



