Many recent books have tackled this vast, complex subject, and surely very few have done so in such calm, reasonable tones as this one. Mr. Blum is well aware that ""capricious and petulant examinations and debate"" would be ""both hazardous and unwise,"" and he knows that Chinese leaders today are deeply entrenched in their distrust of the U. S. But he feels we must try to produce a world with ""both cooperation for the general welfare and toleration..of different social and political systems."" To this end he has cautiously but thoroughly scrutinized all available evidence on Chinese attitudes, the entire history of Sino-American relations, and the geopolitical intricacies of the present situation. He offers no pat answers, and scant encouragement of any sort. He is leery of pragmatists and dogmatists alike. Yet his is precisely the kind of stubborn, humble groundwork that must be done, and circulated in every quarter. if ever there is to be hope of a change for the better.