Franklin Institute, becoming interested in my 

 "tub-culture" as he called it, much of which was 

 carried on on the back roof of my house, himself 

 became an enthusiastic fancier and bred each 

 year, until he died, a great many very beautiful 

 fish. At the size, say of three-quarters of an 

 inch, he would select a lot of the finer ones for 

 rearing, giving the others away. When they 

 were of that size they were fed on earth worms 

 chopped very fine and they developed very 

 rapidly. I have photographs of some of his tish 

 which show tins longer than any I have seen in 

 late years. Several other fanciers were produc- 

 ing very tine lish from this stock when the in- 

 troduction of the new stock from Japan about 

 1889 gave the fancy a greater impetus. 



This was also the beginning of the daphnia 

 industry. 



As a collector of material for biological 

 research, I was familiar with the lower forms of 

 life, and all of the possible sources of supply 

 within a radius of many miles of Philadelphia, 

 the ditches of the "Neck" being an especially 

 rich field, and easily accessible. 



I had for some years been using daphnia and 

 Cyclops as well as mosquito larvse as food for 

 stickelbacks and other small tishes, and as it 

 was abundant near my home, I found the rearing 

 of young goldfish any easy task. I used a grade of 

 bolting cloth that would allow the very young 

 daphnia to pass through as food for the very 

 young tish, and also had tubs in which infusoria 

 were rapidly developed by means of infusions of 

 various kinds, such as of hay, which seemed to 

 me the best of all. 



Dr. Wahl secured the services of a Mr. Dan- 

 nenhower, who for many years kept a Florist and 

 Aquarium Store on Columbia Avenue, above 

 lOth Street, to get the daphnia for him, and so 

 he became the first to supply it to the fanciers, 

 and maintained a monoply of it for many years, 

 until he went out of the aquarium business. 



In those days the streets below Snyder Ave- 

 nue had not been built out to the river bank, 

 and there were no places except ditches in which 

 to tlnd daphnia. Nevertheless, there were stag- 



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