Before the era of nuisance lawsuits, before my own time even, there were glorious toys. One of the all-time best was the fully-loaded chemistry set, which came in a metal box like the one above. To judge from the look of it I'd say this example is from the 40s. I'll bet there were even better ones in the 30s.
Every boy in that era had seen a million mad scientist movies and they were all chomping at the bit to blow things up and transform themselves into monsters a la Jeckle and Hyde. Of course, once they got the set, they got channeled into doing the experiments in the set's book, which were still pretty dangerous and awe-inspiring. 
They also wanted a high-voltage lab like the one in "Frankenstein" and there were electrical sets to fill that need, too. I have a 600,000 volt spark generator in my garage, I guess because I want to make dead bodies come to life just like the kids of that era did. 
If you're interested in hands-on chemistry you should spend 25 bucks for the Granddad's book above. I think Amazon has it. I used to have my own copy and I loved it. Chemistry must have been a lot of fun way back when.
"Popular Science" and "Popular Mechanics" used to be crammed with chemistry-related articles. Here's a small article about evaporation (below) from the March 1948 issue of Popular Science (cover above). Notice that it's not mathematical. Kid chemistry should be taught this way for at least a year before making it mathematical. Get kids interested in the subject first!
The article's below. Click to enlarge.
