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 224 THE CONDOR Vol. XV feet high, were constructed for holding the birds at these various places (see figs. 73, 74). The necessary food, shade and water were given according to the test to be performed. Operations were begun on September 25, I9I 3, and con- tinued until the 8th of the following month. Two dozen Spoonbill ducks were shipped down from the StAte Game Farm at Hayward, these birds being used as subjects and controls in the work. The following experiments and results were obtained. (I) September .25 to October 7, I913- Several dozen sick ducks were brought to station A, and put in cages containing fresh water and good food. Over ninety percent recovered completely. (2) September 26, I9I 3. Three sick ducks were taken from the lake, placed in a cage on the edge of lake, and given good water and food. All three recov- ered completely. (3) September 25, I9I 3. Two Spoonbill ducks from the State Game Farm Fig. 75. THE WRITIR O1 THI PRESINT ARTICLI MAKING A MICROSCOPIC lXAMINATION OF THI BLOOD OF A SPRIG were placed in a cage at station A, and given food, but unboiled lake water only to drink. Both died in less than four days witch symptoms similar to those foumt dead on the lake. The experiment was repeated with like results. (4) September 26, I9I 3. Two Spoonhll ducks from the State Game Farm were placed in a cage at station A and given food, and boiled lake water only, the water being boiled for one hour. Both died in less than four days, with symptoms similar to those found on the lake. The experiment was repeated with like re- suits. (5) September 2 5, I9I 3. Four Spoonbill ducks from the State Game Farm were placed in a cage at station A and kept on good food and good water. These were kept as controls. All remained healthy. (6) September 2 7, I9I 3. Two Dormal birds kept at station A were injected