He compared the effects of various acidic substances , ranging from vinegar to cider , on groups of afflicted sailors , and found the group who were given oranges and lemons had largely recovered from scurvy after six days .
He compared the effects of various different acidic substances , ranging from vinegar to cider , on groups of afflicted sailors , and found that the group who were given oranges and lemons had largely recovered from scurvy after 6 days .