Read this piece of misogyny in high school. Yes, I understand that it's a product of its time. Yes, I have heard the warnings not to "misconstrue" Flatland's "seeming" misogyny, because it's not only a satire of Victorian attitudes toward women, it's satire that's positively "Swiftian", apparently.
Well! In that case, I'm totally revising my opinion before I haul off and pierce a square with my pointy one-dimensionality.
Or rather, on second thought, I don't buy it. Swift was funny. This book isn't.
The thing is, there's a difference between allegory and satire. This book is at its heart an allegory: It uses the language of geometry as a way to figuratively describe Victorian society, sort of, but mostly it's interested in using Victorian society as a way to describe geometry. Its so-called "satire" of the class structure of the society, as expressed in shapes, extends to not much more than stating that the number of sides of a being represents his status in the society: Circles are nobility, pentagons are doctors, squares are lawyers, equilateral triangles are merchants, isosceles triangles are working-class. Women aren't regular polygons, like upstanding men; they aren't even irregular polygons, like the criminals of Flatland. Women are practically pointy lines - just barely existing in two dimensions, parallelograms so narrow as to almost exist in only one. They're considered dangerous, irrational, driven purely by emotion, and so forth. Then there's the Female Code, in which these dangerous pointy line-like women have to use separate doorways and have to keep up a Peace Cry whenever in the presence of men, so as to alert the menfolk to the imminent danger of their presence. Best of all, the book is full of catty asides about their brainlessness, such as "with the usual hastiness and unreasoning jealousy of her sex", "I knew that to any woman in Flatland the narrative of my adventures must needs be unintelligible", "the passion of the moment predominates, in the Frail Sex, over every other consideration", etc., etc.
Here's a fun one:
"Then [the Sphere] proceeded to initiate me into mysteries yet higher than those I had witnessed, shewing me how to construct Extra-Solids by the motion of Solids, and Double Extra-Solids by the motion of Extra-Solids, and all "strictly according to Analogy," all by methods so simple, so easy, as to be patent even to the Female Sex."
Nice! I see what you did there, dude.
None of this, to me, reads satirically. As I said, it's allegorical, which means that to the author, it represents a certain truth. I get that this book is an early example of science fiction, and that many people choose to hold it in reverence for that reason. I can see why mathematicians might like it; it's not like math-oriented fiction is thick upon the ground.
But while I can appreciate how schoolmaster Abbott wanted to use his allegory to explain dimensions to bored schoolchildren, frankly I don't see any non-misogynistic reason to differentiate women in this particular way. If it's a comment on classes in Victorian society, well, women are of as many different classes as men. If it's a satire of the ways in which women are constricted by that society, I'm not sure why it's necessary to only point to this through occasional catty asides about their lack of understanding and brainlessness, without delving into any other aspects of their condition in a restrictive society. He just took a few potshots every now and then, and went back to explaining dimensions. This is supposed to be Swiftian satire? Not so much. Not satire at all, from what I can tell. For that matter, there isn't a whole lot of clever veiled commentary on the lot of the different classes in Flatland, either - just that they are represented by different numbers of sides. Yeah. ALLEGORY.
And I've read the preface to the second and third editions, which is considered by some to be the clue that indicates the author didn't really believe what he wrote on that front. It was written a few years after the initial publication, from the "perspective" of the sphere from Spaceland, which, existing in an additional dimension, is considered to be more enlightened than the square that "authored" the book. So, in this preface, the sphere says:
"It has been objected that he is a woman-hater; and as this objection has been vehemently urged by those whom Nature's decree has constituted the somewhat larger half of the Spaceland race, I should like to remove it, so far as I can honestly do so. ... Acting, therefore, as his interpreter and summarizer, I gather that in the course of an imprisonment of seven years he has himself modified his own personal views, both as regards Women and as regards the Isosceles or Lower Classes. Personally, he now inclines to the opinion of the Sphere that the Straight Lines are in many important respects superior to the Circles. But, writing as a Historian, he has identified himself (perhaps too closely) with the views generally adopted by Flatland, and (as he has been informed) even by Spaceland, Historians; in whose pages (until very recent times) the destinies of Women and of the masses of mankind have seldom been deemed worthy of mention and never of careful consideration."
Bolded emphasis mine. The square has modified his own personal views, the sphere says. Uh huh. In other words, those original views were indeed misogynistic? (And what the heck does he mean by "in many important respects", I wonder...I went back to double-check this, and I see absolutely nothing about what Spheres supposedly think of women. Apparently the satire doesn't extend to three dimensions. Oh, whatever, it's just tiresome.)
Look, I don't honestly know what views this man held in his own life; I haven't seen any non-Flatland writings of his. But in their absence, and as Abbott was a schoolmaster, he would perhaps have appreciated the application of the philosophical principle known as Ockham's razor to this question. Contrary to popular belief, the principle of Ockham's razor doesn't really suggest that the simplest explanation is best: It suggests that, when considering competing hypotheses, the one that makes the fewest assumptions should be selected. It seems to me that people have to bend over backwards to defend this book against charges of misogyny; calling it out as frankly misogynist (and yes, a product of its time), on the other hand, requires far fewer assumptions about the author's intention. So until some additional data turn up that would allow empirical testing of either hypothesis, I don't see any reason to buy the more tortured explanation, which ends up sounding simply apologistic.