
It was during one of those rotations that I first found a copy of Eleanor Cameron’s Mr. Bass’s Planetoid. Of course I had to check out right away because it had “planetoid” in the title! It was clear from nearly the first page that this was a sequel. Two best friends, Chuck and David, are friends with an eccentric scientist, Mr. Tyco Bass, who helped them with their homemade rocket previously. Another scientist, Prewytt Brumblydge, has stolen a sample of a mysterious metal Mr. Bass had discovered in a meteorite, and soon he is using this metal to power a machine with which he hopes to solve two of the world’s problems: the lack of safe drinking water in some parts of the world, and the need for electricity. Unfortunately, the machine has dangerous side effects that could destroy the entire planet. The boy’s learn this part from yet another scientist who happens to be Brumblydge’s former teacher, who is convinced the student is looking for the source of Mr. Bass’s mysterious metal.
The problem is that Mr. Bass is nowhere to be found…
Checking Mr. Bass’s notes, they see that he thought the meteor came from yet another invisible moon circling the Earth. The boys have reason to believe that Brumblydge has also seen the notes and will try to reach this moon to get more of the metal. Unfortunately, the boys’ homemade rocket ship was damaged at the end of their previous adventure, so they can’t just fly off to try to intercept Brumblydge. The boys have to contact Mr. Bass’s cousin, Mr. Theo Bass, who helps them repair the ship. Theo is also able to confirm that Tyco has left Earth and is visiting friends on the invisible moon, Basidium, which the boys visited in their earlier adventure.
The boys rocket off to the smaller planetoid. Brumblydge is found and convinced not to turn on his machine. He also meets the inhabitants of Basidium, and everything ends happily ever after.
Two of my favorite details from this book were: among the repairs that Mr. Theo Bass makes to the rocket is to install magnets on the fins of the rocket so when it lands on the very small planetoid it won’t drift off. I remember thinking that if magnets were needed for the fins, shouldn’t magnets also be added to the boys’ boots? But I don’t think that was ever addressed. The other is that the reason no one knows about the small planetoid orbiting merely 1000 miles above the earth is because it is only visible in “infragreen light.” So Mr. Theo Bass also has to make special goggles for the boys so that they can see it.
It was a very silly book. But, also very intriguing. Ten-year-old me couldn’t turn the pages fast enough on the first read-through. I read it a few times before taking it back to the library, where I asked the librarian whether the earlier book was available. The librarian told me that if they had it, it was in storage.

A few months later the librarian brought out the sixth book in the series, Time and Mr. Bass, whose plot I remember even less than the previous. I do remember that the book began at a secret conference of all the mushroom people who were living among humans in secret. But not much more.

So, somehow, the engine and controls and navigation system the boys cobbled together literally from junk is just exactly perfect for the rocket fuel that they didn’t know any of the properties of. Anyway, he explains to them about this invisible second moon he has discovered orbiting 50,000 miles about the Earth, which you can only see with special equipment, and sends them to explore this mysterious planet. And before they leave, he advises them to take a mascot, because otherwise the mission will fail. So, on a whim before taking off the next day at the appointed time, they grab a chicken from one of the boys’ back yards, and take her to Basidium, which is covered in giant mushrooms and inhabited by green-skinned people with large heads. The aliens introduce themselves as Mycetians, who are evolved from mushrooms, but lament the fact that their entire population is dying of a mysterious disease. The boys, of curse, solve the disease problem (if you guessed that the chicken was involved in the solution, you would not be wrong), and journey back to Earth to report all to Mr. Bass. Oh, the the rocket is damaged on the return trip somehow.

By the time I finally got to read the first two books in the series I had aged out of the target demographic. And even when I was the age they were meant for, I kept noticing lots of logical and scientific flaws in the books (How can all of these people, including David and Chuck’s parents, know about these invisible moons and the intelligent aliens living on them, but word never gets out? If Basidium and the other planetoid are made of super dense material such that they have nearly-Earth-like gravity, why haven’t scientists detected the gravitational effects of either one? How did Mr. Bass know that boys wouldn’t need spacesuits?). But there was something incredibly engaging about the way they were written. Not to mention the idea that one could build a rocket from scrap wood and junk tin and rocket off to other worlds for adventure!
And don’t get me started on the complete lack of any women or girls among the cast of characters!
But the idea that maybe I and a friend could build our own rocket and fly to another world was plenty exciting. That there were people like Mr. Bass who didn’t fit in and were thought of not just as crazy but as freaks, yet they could still be heroes was an important bit of encouragement for a ten-year-old queer science geek. So, these very silly books will always hold a special place in my heart.
I remember those books quite fondly. The Marblehead Public Library had all of them and I devoured them all. I had forgotten them up until now, so thanks for dredging them up out of my memory.
Fond memories for the win!