Eight British government expeditions for observing total solar eclipses were conducted by him between 1870 and 1905.
It appears to be common in the neighbourhood of Cape Town, while the recent Antarctic expeditions have shown that it occurs in various localities from the Falkland Islands to the Antarctic circle.
Dr Natterer, the chemist of the " Pola " expeditions, has expressed the opinion that the poverty of the pelagic fauna is solely due to the want of circulation in the depths.
His ambiguous conduct, however, led to the despatch of two expeditions against the Mirdites and the devastation of their territory.
A portion of one of the expeditions he despatched, under Juan de Ayolas, pushing up the Paraguay, is said to have reached the south-east districts of Peru, but while returning laden with booty, was attacked by the Payagua Indians, and every man perished.