History of botanical science

penetrate. I looked for the usual introduction on "How to use this book", and did not find it, until page 39. Equally, it takes a little searching to find out why a large section of the listed material is not actually reproduced in the book, but is on the microfiche. Finally, the coverage of countries is heavily towards Britain and North America, although this is only explained in one of the essays. Even this enormous survey is not exhaustive, and should not be regarded as such. However, I am sure that motivated users of the catalogue will be able to cope with these problems and be helped considerably in the location of archival material. Edward Yoxen Department of Liberal Studies in Science University of Manchester