'The criterion of true beauty' , wrote Fulke Greville, 1st Baron of Burke, 'is that it increases on examination; if false, that it lessens. There is therefore something in true beauty that corresponds with right reason, and it is not the mere creation of fantasy.' The authors of this compact volume have increased the beauty of an area that is commonly and rightly ac­ knowledged to be one of the loveliest parts of the Great Lakes. They have done this by integrating the historical, industrial, and cultural influences on 'Lake Manitoulin' in sixteen manuscripts. It is enigmatic that Lake Huron, the second of the Great Lakes to be discovered by European explorers, has been the last to be adequately described Iimnologicaliy. As recently as 1966, for example, Alfred M. Beeton wrote in Limnology in North America: ' ... even a list of the more common species comprising the plankton of Lake Huron could be an original contribution to scientific literature.' Comparable statements could have been made for sediments, benthos, and water chemistry. This volume reflects a change of course and Georgian Bay and the North Channel of Lake Huron are now on the scientific map. Science is 'right reason'. Its application to Georgian Bay and the North Channel is a welcome and timely addition for the renewal of public, political, and scientific interest in the conservation of the Great Lakes.

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2. Great Lake Manitoulin: Georgian Bay and the North Channel.- 3. On the physical limnology of Georgian Bay.- 4. Distribution and composition of the surficial sediments of Georgian Bay and the North Channel.- 5. Geology and environmental significance of sediment distributions in an area of the submerged Niagara escarpment, Georgian Bay.- 6. Chemical limnology of Georgian Bay and the North Channel between 1974 and 1980.- 7. Phytoplankton and phosphorus in southern Georgian Bay, 1973-1982, and implications for phosphorus loading controls.- 8. Georgian Bay phytoplankton: Ecology and response to contaminants.- 9. The phycological studies in the North Channel.- 10. Plankton community structure and size spectra in the Georgian Bay and North Channel ecosystems.- 11. The benthic macro-algae of Georgian Bay and the North Channel and their drainage basin.- 12. The dominant attached filamentous algae of Georgian Bay, the North Channel and Eastern Lake Huron: Field ecology and biomonitoring potential during 1980.- 13. Zooplankton filtration rates in Lake Huron. Georgian Bay and North Channel.- 14.Changes in the Georgian Bay fish community, with special reference to lake trout (Salvelinus namaycush) rehabilitation.- 15. Changes in the North Channel fish community, with emphasis on pink salmon (Oncorhynchus gorbuscha Walbaum).- 16. A comparison of the effectiveness of sea lamprey control in Georgian Bay and the North Channel of Lake Huron.