In 1902 G. Elliot Smith wrote of the brain of a species of dolphin called “Delphinus tursio” (which may be the modern _Tursiops truncatus_): “This brain is larger and correspondingly richer in sulci than that of the porpoise: but the structure of the two organs is essentially the same.” His drawings are shown in Figures 7 and 8. He said further, “the brains of the Beluga and all the dolphins closely resemble that of the porpoise.” Smith summarizes the discussion of the huge size of the whale’s brain. “The apparently extraordinary dimensions of the whale’s brain cannot therefore be considered unusual phenomena, because this enormous extent of the cerebral cortex to receive and ‘store’ impressions of such vast sensory surfaces becomes a condition of survival of the animal. “The marvelous complexity of the surface of the cerebrum is the direct result of its great size. In order, apparently, that the cerebral cortex may be efficiently nourished and at the same time be spared to as great a degree as possible the risk of vascular disturbances [such as would be produced by large vessels passing into it], its thickness does not appreciably increase in large animals. [He then quotes Dubois’ figures showing that the whale’s cortex is the same thickness as that of the human.] Such being the case, it naturally results that the increased bulk of cortex in large animals can only be packed by becoming thrown into increasing number of folds, separated by corresponding large number of sulci.”[4] In regard to communication between individual whales, Scammon in 1874 wrote the following: “It is said that the Cachalots [Sperm Whales] are endowed with the faculty of communicating with each other in times of danger, when miles ... distant. If this be true, the mode of communication rests instinctively within their own contracted brains.”[5] Let us not forget that Scammon was talking about the mammal with the largest known brain on this planet. Instinct as the sole cause of communication with a brain this size seems rather improbable. This brain is not any longer considered “contracted.” Both of these statements illustrate an authoritative view of that time. If one peruses the paper by Tokuzo Kojima, “On the Brain of the Sperm Whale” (in the _Scientific Reports_ of the Whales Research Institute, Tokyo, VI, 1951, 49-72), one can obtain a modern clear view of this brain. The largest one that he obtained (from a 49-foot sperm whale) was 9,200 grams. The average weight of the sixteen brains presented in his paper is 7,800 grams for average body lengths of 50 feet. (The brain weight per foot of body length varied from 118 to 187 grams per foot, averaging 157; man’s ratio averages about 250 grams per foot.)