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DEPARTMENT OF COMMERCE 



Bureau of Fisheries 



Washington 



March 6, 1920. 



Mr. F. K. Christine, - 3 . 



518 Belgrade Street, 

 Philadelphia, Pa. 

 Dear Sir : 



I wish to advise that the Bureau purchased six boxes of your creative infusoria 

 for the purpose of making some laboratory tests and tests at some of our stations 

 for the purpose of determining its value in the creation of minute aquatic life. Very 

 favorable reports have been received, and the experiments made at Washington have 

 demonstrated that it is very excellent material for the production of infusoria. It is 

 believed, however, that the amount you suggest to use to fifty gallons should be 

 doubled. If the temperature of the water is in the neighborhood of 60 or 65 degrees 

 F., much better results may be expected. If this is followed up by the production of 

 daphne and other aquatic insects it is believed that the aquarist can have a very good 

 range of aquatic life and at a very reasonable cost. It was found preferable to 

 infusoria produced by hay in that it did not discolor the water, and the infusoria 

 appeared in greater numbers than the culture produced by hay. It was thought that 

 you might be interested in receiving this information. 



Very truly yours, 



G. C. LEACH. 

 In Charge Division Fish Culture 



Nuff said ! See my other ad.— Francis K. Christine. 



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Live Food is Nature's Food 



Give your fishes white worms, which can 

 be raised indoors throughout the year. 

 Generous portion, 60 cents, with full instruc- 

 tions for propagation. (Successor to C. E. 

 Jenne.) _ 



W. J. WRIGHT 



Bergen Avenue and Mercer Street, 

 Jersey City, N. J. 



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IH>RB1>BBBBBB>H»M 



Red-bellied Dace 



$5.00 per dozen, including can, or will ex- 

 change for other fishes. Our price list is 

 sent on request. 



The Aquarium Fish Hatchery 



838 Humboldt Avenue, Milwaukee, Wis. 



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Imported Helleri 



We have received direct from Central 

 America 200 Swordtails (Xiphophorus 

 helleri). The collector, unfamiliar 

 with the sexes, sent all males. This 

 circumstance affords aquarists an ex- 

 ceptional opportunity to inject new 

 blood into their inbred stock. Sturdy 

 specimens, three-fourths grown, 6 for 

 $5. Shipping can, 50 cents additional. 



CRESCENT FISH FARM 



1624 Mandeville Street, New Orleans, La. 



The 



Microscopy of Drinking 



Water 



By GEORGE CHANDLER WHIPPLE 



Professor of Sanitary Engineering in 

 Harvard University. A book having 

 a direct bearing on the work of the 

 aquarist. Even without a microscope 

 it will enable him to comprehend the 

 factors controlling the character of 

 the water used in his tanks. It de- 

 scribes the methods of examination 

 assisting in the identification of com- 

 mon organisms found in city water, 

 and interprets the results. 



The third edition, rewritten and en- 

 larged, contains 409 pages, with 74 

 figures, 6 full-page plates in the text, 

 and 10 plates giving 235 illustrations 

 of organisms in color. Price, post- 

 paid, $4.50. 



The Book Department 

 Aquatic Life 



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