UNDERWATER GUIDEPOSTS: HOMING OF SALMON. By Arthur D. Hasler.

1966 1st edition. Ppxii,155. B/w photographs and line illustrations, tables and graphs, bibliography. Turquoise cloth.

"The unerring instinct which can lead animals safely over thousand-mile migrations, the sure knowledge which drives salmon many weeks' journey up the rivers of their birth to the spawning grounds, have long fascinated laymen and scientists alike. [This book] recounts the experiments and conclusions reached at... the Laboratory of Limnology at the University of Wisconsin, under the direction of Professor Arthur D. Hasler." Chapters include; 1. Stream phase of salmon homing - Hypotheses; laboratory tests of the Odor Hypothesis; Field tests of the Odour Hypothesis; Significance of olfaction from the river mouth to the natal stream; 2. Oceanic phase of salmon homing - Open sea migration; A model of oceanic orientation; Sun-compass orientation; Alternative and supplemental types of orientation; 3. Closing the migratory cycle - Migration from the stream to the sea; Summary - the complete hypothesis. Very well worth reading.