i'i^;ure 



Page 



2iio Distribution of fish in pens, experiments 73-73 , 



25o Distribution of fish i- pens, experiments 79-8U < 



26, Distribution of fish in pens^ experiments 85-88 . 



27. Distribution of fish in pens, experiments 89^ 90. 

 23. The Bell Telephone transducer, frequency 200 c.p< 



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28 



29 

 30 

 31 



36 



