In the early years of his super-heroic career, Superman was not endowed with the power of flight. Although he possessed superhuman speed, he moved from place to place by running or by executing gigantic leaps. Month by month, however, Superman's running speed increased, along with the length of his leaps and the complexity of the aerial maneuvers he was able to perform once he had left the ground. The transition from leaping to actual flying was extraordinarily gradual and was punctuated with a great deal of inconsistency. Not until May 1943 is Superman explicitly referred to as a "being who can fly like a bird" and not until later that same year can it be said, without qualification, that Superman actually possesses the power of flight.
In June 1938, a bullet ricochets off Superman's tough skin and a knife blade shatters when it strikes his body. Nothing less than a bursting shell could penetrate his skin. Subsequent texts describe Superman as possessing a skin impenetrable to even steel and as being impervious to bullets because of an unbelievably tough skin. A text dated January 1945 notes that "Unlike ordinary people, the Man of Steel can do without food if necessary," but a later text contradicts this, noting that Superman could indeed "starve to death."
In Superman's earliest adventures, however, he exhibited no special optical powers, and the vision abilities he employs today are the products of a gradual evolution spanning many years of texts. Tracing the evolution of these abilities is difficult, for the terminology used to describe them is often haphazard and confusing. "Telescopic X-ray vision," for example, used as a general term in many early texts to denote Superman's ability both to see through objects and to see objects from far away, later comes to refer to the use of both of these visions simultaneously.
"Super-vision," however, both with and without the hyphen, has been employed at various times in the chronicles as a synonym for telescopic vision; as a means of describing Superman's ability to perform some complex optical feat, such as tracing television broadcast signals to their source; and as a term denoting a combination of X-ray vision and telescopic vision, the meaning it has today.
Similarly, Superman used his X-ray vision to analyze the chemical composition of substances, to melt solid objects, and to see in pitch darkness long before the more specialized terms microscopic vision, heat vision, and radar vision ever appeared in the chronicles.
Some terms, such as "super-sensory sight," "super-sensory-vision," and "supernormal vision" are used in the texts without ever being defined precisely.
In his very earliest adventures, however, Superman exhibited no special aural powers, and the super-hearing he employs today is the product of a gradual evolution spanning many years of texts. The term "super-hearing" first appears in the chronicles in Fall 1939. Nevertheless, during the first two decades of Superman's career, the texts also employ such other descriptive terms as "super-acute hearing," "super-sensitive hearing," "hyper-keen hearing," and "super-keen hearing."
In January 1939, Superman is described as having "sensitive ears," which enable him to hear things ordinary human beings cannot.
In November 1940, Superman's super-sensitive ears enable him to pick up radio waves so that he can listen in on a radio news broadcast without a radio. In 1942, his super-sensitive hearing enables him to trace radio waves to their source.
A text dated August 1939 notes that Superman can hold his breath for hours underwater.
In January 1940, he blows out a flaming torch with a powerful puff of his breath.
A text dated March 1941 notes that Superman's lungs can withstand any air pressure, no matter how great, and a later text observes that Superman can swim thousands of fathoms deep, down to the ocean bed itself, without suffering any ill effects.
In June 1941 Superman extinguishes a raging fire with a terrific gust of breath and in 1947 he extinguishes a bonfire by inhaling the flames.
In 1941, Superman employs ordinary ventriloquism to distract the attention of criminals holding Lois Lane.
In Spring 1940 Clark Kent exhibits the ability to temporarily halt the beating of his heart. In several occasions in subsequent years, Superman employs this unique ability in order to enable him to feign death. Superman #21 alludes to Superman's having temporarily halted the beating of his heart and put himself into a state of suspended animation.
In Summer 1940, Superman is described as possessing a photographic memory.
In January 1941 Superman cures Lois Lane of her amnesia by means of hypnosis and a month later, as Clark Kent, he hypnotizes her into forgetting the super-feats he is about to perform so that he can rescue her from a burning cabin in his role as Clark Kent without betraying his dual identity.
Superman's super-coordination enables him to sign two autographs simultaneously, one with each hand, and a transfusion of his alien blood has the power to make a critically ill person well again within a matter of moments. (Superman #6, 1940)
One super-power that has long since been discarded by the chroniclers is Superman's ability, displayed on a number of occasions in the 1940s, to radically alter his facial characteristics and even his size through what was described as "superb muscular control" of his "plastic features."
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