Menzies made a third attempt to summit Mauna Loa in February 1794. This time the botanist consulted King Kamehameha I for advice and learned that he could take canoes to the south and follow the ʻAinapō Trail, not knowing of its existence beforehand. Significantly better prepared, Menzies, Lieutenant Joseph Baker and Midshipman George McKenzie of "Discovery", and a servant (most likely Jonathan Ewins, listed on the ship's muster as "Botanist's L't") reached the summit, which Menzies estimated to be high with the aid of a barometer (consistent with a modern value of ). He was surprised to find heavy snow and morning temperatures of , and was unable to compare the heights of Mauna Loa and Kea but correctly supposed the latter to be taller based on its larger snow cap. The feat of summitting Mauna Loa was not to be repeated for forty years.