The Pooles have (singly or together) investigated such widely different matters as caves, diving, ballooning and volcanoes, to mention only a few. They are always concise, accurate and interesting. This time they have brought together information on a group of the occupations that appeal to the physically and intellectually rugged and (strangely enough) fascinate the type that will not tolerate discomfort but love to consider it. These are the out-in-all-weathers scientists -- the herpetologists, ornithologists, anthropologists, geographers etc. -- who seldom get a showing in the ""this is your career"" series. For each of these, the authors have supplied a short history of the field, its most important practitioners, their writings (from which they quote) and their qualifications. An unusually interesting group of occupations well defined.