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The Fate of the Poseidonia is a 1927 short story by Clare Winger Harris, who was one of the early female science fiction authors. It's interesting to read stories that place the 1940s in a future time and fascinating to see the changes they expected. You can read it online here. It begins,
The first moment I laid eyes on Martell I took a great dislike to the man. There sprang up between us an antagonism that as far as he was concerned might have remained passive, but which circumstances forced into activity on my side.
How distinctly I recall the occasion of our meeting at the home of Professor Stearns, head of the Astronomy department of Austin College. The address which the professor proposed giving before the Mentor Club of which I was a member, was to be on the subject of the planet, Mars. The spacious front rooms of the Stearns home were crowded for the occasion with rows of chairs, and at the end of the double parlors a screen was erected for the purpose of presenting telescopic views of the ruddy planet in
its various aspects.
As I entered the parlor after shaking hands wit my hostess, I felt, rather than saw, an unfamiliar presence, and the impression I received involuntarily was that of antipathy. What I saw was the professor himself engaged in earnest conversation with a stranger. Intuitively I knew that from the latter emanated the hostility of which I was definitely conscious.
He was a man of slightly less than average height. At once I noticed that he did not appear exactly normal physically and yet I could not ascertain in what way he was deficient- It was not until I had passed the entire evening in his company that I was fully aware of his bodily peculiarities. Perhaps the most striking characteristic was the swarthy, coppery hue of his flesh that was not unlike that of an American Indian. His chest and shoulders seemed abnormally developed, his limbs and features extremely slender in proportion. Another peculiar individuality was the wearing of a skull-cap pulled well down over his forehead.
Professor Stearns caught my eye, and with a friendly nod indicated his desire that I meet the new arrival.
"Glad to see you, Mr. Gregory," he said warmly as he clasped my hand. "I want you to meet Mr. Martell, a stranger in our town, but a kindred spirit, in that he is interested in Astronomy and particularly in the subject of my lecture this evening."
I extended my hand to Mr. Martell and imagined that he responded to my salutation somewhat reluctantly. Immediately I knew why. The texture of the skin was most unusual. For want of a better simile, I shall say that it felt not unlike a fine dry sponge. I do not believe that I betrayed any visible surprise, though inwardly my whole being revolted. The deep, close-set eyes of the stranger seemed searching me for any manifestation of antipathy, but I congratulate myself that my outward poise was undisturbed by the strange encounter.
The guests assembled, and I discovered to my chagrin that I was seated next to the stranger, Martell. Suddenly the lights were extinguished preparatory to the presentation of the lantern-slides. The darkness that enveloped us was intense. Supreme horror gripped me when I presently became conscious of two faint phosphorescent lights to my right. There could be no mistaking their origin. They were the eyes of Martell and they were regarding me with an enigmatical stare. Fascinated, I gazed back into those diabolical orbs with an emotion akin to terror. I felt that I should shriek and then attack their owner. But at the precise moment when my usually steady nerves threatened to betray me, the twin lights vanished. A second later the lantern light flashed on the screen. I stole a furtive glance in the direction of Martell. He was sitting with his eyes closed.
"The planet Mars should be of particular interest to us," began Professor Stearns, "not only because of its relative proximity to us, but because of the fact that there are visible upon its surface undeniable evidences of the handiwork of man, and I am inclined to believe in the existence of mankind there not unlike the humanity of the earth."
The discourse proceeded uninterruptedly. The audience remained quiet and attentive, for Professor Stearns possessed the faculty of holding his listeners spell-bound. A large map of one hemisphere of Mars was thrown on the screen, and simultaneously the stranger Martell drew in his breath sharply with a faint whistling sound.