Instruct: Classify Amazon reviews into positive or negative sentiment
Query: This was a good book on an interesting topic

Scurvy took a terrible toll on sailors for many years. This book describes the search for a cure for this terrible disease. It was not obvious at the time (especially given that sailors had a lot of other health problems, especially on long voyages to the tropics) that it was simply a matter of dietary deficiency. It also shows how contemporary medical theory (still following the classical four humours theoretical framework) was a barrier to better understanding and a scientific approach. Finally, life was cheap where lemon juice was expensive and it took very definite proof of its relative efficacy to convince the Royal Navy to provide a ration of lemon juice to its sailors. The book is well done, combining a scientific story with high seas adventure during the age of sail.