A few minor flaws in the book, such as improper uise of some terms and lack of explanatory footnotes in one or two important tables, could lhave been eliminated by stricter editing; these are, however, inconsequtential defects. The volume is a valuable, useful and on the wlhole readable account of the investigations between 1967 an(d 1969 into the Marburg virus disease. This work is concernied ...

of scanninig electron microscopes, perlhaps with a list of companies wlhich manu-factture the iinstrtunien-t. However this is a minor omission in a most enjoyable an(d useftul book. This volume presents the work of a small internatioinal conference on pyrogens an(l fever sponsored by the Ciba Foundation and lheld in London in July 1970. The purpose of the symposium was to review some of the are...