A) I loved Ralph 124C41+. I find that (outside of certain insane British critics who feel that Gernsback “stole” S.F. from the Brits ( :rolleyes: ) the problem most people have with Ralph is that they’re trying to read it as though it’s a novel. And it isn’t. No rising action, no serious character development, the climax is clunky as hell and obviously tacked on in an attempt to make it seem…novel-ish and notable only for predicting radar.
However, read as a travelogue of the future (a-la “Through Darkest Africa with Gun and Camera”) it’s a stunningly good period piece filled with unbounded optimism, enthusiasm and “sensawonda”.
B) Regarding the reprints that Ike talks about, as far as I know (which isn’t very far, admittedly), Arcturus was last published as a Ballantine “Unicorn Fantasy” edition in the late '60s, which are getting hard to find, Moon Pool was in an Avon edition from the early to mid '70s, my edition of Dr. Lao was from the early '60s and I’ve never heard of The Wonder
Of the three I’ve read (or tried to read), Lao is the obvious winner…stylish, clear, readable prose…a great book. I’ve never made it all the way through Merritt. Any Merritt. His stuff is just a trifle too…um…Weird-Talesy to me. Of Arcturus, I’ve heard Lindsay described by someone as the Ed Wood of SF/F. He had these really good ideas (ok, it’s not a perfect comparison
) that he was desperate to share and absolutely no ability to communicate them. I read Lindsay when I was on a “Unicorn Fantasy”* kick about 15-20 years ago and frankly I remember nothing about it except that it had some profoundly weird imagery.
Also, Ike, if you’re looking for another source for fantastic SF (although more of the 1940-1960s era stuff), try NESFA. They seem dedicated to bankrupting me. 
BTW: I just picked up an old SF book called The Second Deluge by Garrett Serviss (published by Hyperion Press). Anyone ever read it?
Fenris
*For those not in the know, following Ballantine getting the rights to publish Tolkien in the mid/late '60s, Lin Carter (IIRC) decided that the time was right to reprint a bunch of old, nearly forgotten fantasy (and some new stuff, Joy Chant and Katherine Kurtz both got their start here): there was a fantasy craze and so they published about 60 books all with a little logo of a unicorn on the cover (the line was officially called the “Adult Fantasy” line). They published some great stuff. Ike, if it turns you enjoy the stuff you’ve gotten, you might want to start hunting up the Unicorn Fantasy line.