Specimens of stalagmites will be collected and reconstructed for the American Museum of Natural History. The explorers expect to find also flying fish, flying salamanders, rare insects and thousands of bats. A Government representative will go along, and drawings and motion pictures will be made. _The Readers' Corner_ _A Meeting Place for Readers of ASTOUNDING STORIES_ _A Letter and Comment_ Three or four times in the year we have been issuing Astounding Stories the Editor has received letters calling attention to fancied scientific errors in our stories. All these letters were published, but until now we have not cut in on the space of "The Readers' Corner" to answer such objections because they were very obviously the result of hasty or inaccurate readings. The other week one more such letter reached us--from Mr. Philip Waite, this time--claiming that there was "an atrocious flaw" in two stories of Captain S. P. Meek's. This we could not let go unanswered, first because of the strong terms used, and second because the objection would sound to many like a true criticism; so we turned the letter over to Captain Meek, and his answer follows Mr. Waite's letter below. We welcome criticism of stories in our "The Readers' Corner." Never yet have we withheld from it any criticism or brickbats of importance--and we never intend to. But space is limited; there's not room now for all the good letters that come in; and we do not want to intrude too much with editorial comment. Therefore when we do not stop and answer all criticisms we are not necessarily admitting they are valid. In most cases everyone will quickly see their lack of logic or accuracy, and in the rest we will ask you to remember that our Staff is meticulously careful about the scientific facts and laws and possibilities that enter our stories, so it's extremely unlikely that anything very "atrocious" will get by. Well, we'd better cut short now, before we take up too much "Corner" room. But first, thanks to Captain Meek for going to the trouble of defending two stories that needed no defense. And thanks, too, to Mr. Waite, for his kindness in writing in to inform us of what he thought--unquestionably because of hasty reading--were errors.--_The Editor._ P. S. (Now we'll have to be _super_ careful of our science, for if Mr. Waite ever gets anything on us--!!) Dear Editor: Just a note to tell you to keep up the good work. There was an atrocious flaw, however, in the two stories by Capt. S. P. Meek about the Heaviside Layer. How, may I ask, do meteors penetrate through that imaginary substance which is too much for a powerful space flyer? Also, how about refraction? A substance denser than air would produce refraction that would have been noticed long ago. I don't mind minor errors, but an author has no right to ignore the facts so outrageously. Fiction goes too far when an author can invent such false conditions.