It has been said that scientific truths begin as heresies and end as myths, enjoying a period of orthodox acceptance in between. It must be rare, if this is so, for a myth to be imposed upon the public as a “truth”, to be accepted immediately as such, and then to suffer excommunication as heresy. Such a case is at hand in the matter of the sea-life area of the Atlantic Salmon in Davis Strait and of the start of a new pelagic fishery.

In 1967 the Scott Polar Research Institute (SPRI) undertook the first longrange airborne radio echo soundings of the Antarctic ice sheet. The results of this season were encouraging and led to other programmes being organized in 1969–70, 1971–72, and 1974–75. The initial impetus for this work came from A. P. Crary of the US National Science Foundation (NSF), who suggested that the radio echo equipment that had been developed at SPRI under the direction of S. Evans and G. de Q. Robin, with financial assistance from the Royal Society's Paul Instrument Fund and later from the Natural Environment Research Council (NERC) should be operated over the Antarctic ice sheet, and he offered the logistic support of the US Antarctic Research Program (USARP). Since those early flights, a productive relationship has been developed between SPRI and that arm of NSF represented by USARP and US Navy Task Force 43 (now 199) and, up to the end of the 1971–72 season, it had resulted in 210000 km of radio echo profiling in the Antarctic. A further 135 000 km was accomplished during the 1974–75 season.

There have been many great men in the history of the Canadian eastern Arctic, and it must be admitted from the start that Jackson was not one of them. He was a minor figure, but in the early years of this century he exerted an influence in the region out of proportion to his own importance. It may be that he did nobody any good, and it is true that nobody had any good to say of him. What Jackson did was to promote his own fantasies until solider men fell under his spell, and these men then took actions that ended disastrously. But, when surveying the career of Captain Jackson, one may depart from the usual opinion that he was a rogue and a liar. He was unstable—unstable to, and probably beyond, the point of insanity—and he deserves more sympathy than he received from his contemporaries.