313

LLDon?t be intimidated by the jargon used by those already in the field;

make the experiments if you want to understand the phenomena-” (9. 69) “Like it or not, relations between binary and tracer diffusion are empirical

approximations.” (p. 89)

Inevitably, there are a few things that merit at least a mild complaint, The author’s frankness, usually refreshing, sometimes leads to excessive cuteness, as in, “Diffusion in liquids was suddenly clarified by Thomas Graham (1850), who apparently had become tired of confusing everyone by working with gases.” $ I ome of the proofreading was faulty - especially in Chapter 3 the symbols j and v in equations sometimes vanish, leaving only their ghostly sub- scripts and superscripts. Chapter 7 is weak. A few favorite subjects get, short shrift, such as convection caused by diffusion. This gets only two short paragraphs in Chapter 9, but is a whole subject in itself under names like salt fingers, oscillatory instabilities, and double-diffusive phenomena - see, for example, Scientific American for June 1971 or Annual Reviews of Fluid Mechanics for 1974. But these faults are more than outweighed by virtues.

My overall recommendation: read this book; it will do you good, and you may even enjoy it.

E.A. MASON Bo wn University, Bovidence, R. I.

Forthcoming event ti______ __~

August 21-25, 1978 6th International Congress CHlSA ‘78

The 6th International Congress of Chemical Engineering, Chemical Equipment Design, and Automation will be held on the above dates in Prague. The Congress is sponsored by the Czechoslovak Committee for Industrial Chemistry and by the Czechoslovak Chemical Society. The Con- gress is the 201st event of the European Federation of Chemical Engineering.

Besides other topics, special attention will also be devoted to Membrane Processes. This section will be prepared in colaboration with the Working Party for Membrane Processes set. up within the Division of Chemical Engineering.

Original papers, short communications, state of the art reviews, process applications, and case histories on membrane structure and transport, membrane processes, and membrane module2 are invited,

Summaries of tibout 150-300 words in English should be sent before Sept. 30, 1977. Full texts in English should be submitted before April 30, 1978. Address for correspondence: 6th Congress CHlSA ‘78, P. 0. Box 857, 111 21 Praha 1, Czechoslovakia, Cables: CHISA Praha.