Why was studying Portuguese man-of-war specimens easier at sea than on land?

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Studying Portuguese man-of-war specimens was easier at sea because the organisms decomposed too quickly to be effectively examined anywhere else. During his service as an assistant surgeon on HMS Rattlesnake, Thomas Henry Huxley conducted his research by lashing his microscope to a table in the ship's chart room, allowing him to observe these delicate creatures in their natural environment before they could break down.1