Buried in the preface of a 1914 textbook is a pedagogical philosophy that today's education-reform crowd thinks they invented. John Ferguson Snell, Professor of Chemistry at Macdonald College, McGill University, opens his textbook with this declaration:

The principle which has been kept constantly in mind is to introduce the applications of chemistry to household affairs as early and as often as possible and to present only such portions of the subject matter of theoretical chemistry as is essential to the comprehension of these applications. In this way the student's interest is enlisted and maintained — a most important consideration in the teaching of an applied science.

That's "problem-based learning" and "just-in-time theory" delivered straight, more than a century before they became conference-circuit buzzwords. Snell is openly inverting the standard chemistry curriculum: don't drill students on the periodic table and stoichiometry until their eyes glaze over, then promise that one day it'll be useful. Start with why the bread rises, then introduce only the theory needed to explain it.

The context makes it more interesting. Snell explains that this book exists because:

The recent development of courses of instruction in Home Economics in America has created a field for textbooks pre­pared to meet the special needs of this new class of students.

So who were these students? Women. Home Economics in 1914 was the back door through which serious science education reached women in American and Canadian universities at scale. The "household chemistry" framing was partly genuine pedagogy, partly a cultural compromise — you could teach a woman acid-base chemistry as long as you called it "laundry." And under that compromise, Snell ended up doing something pedagogically radical: he stripped chemistry of its theory-first scaffolding and rebuilt it around real problems.

What modern readers should notice:

• The applied-science track was taught to women. The "real" chemistry — theory-first, abstract — was reserved for the men in the engineering and pre-med tracks. The applications-first approach we now consider progressive was, at the time, considered the lesser path.
• Snell's audience had "no previous instruction in the science." He is writing for absolute beginners and refusing to drown them in theory. Compare this to the modern intro chem course that still front-loads electron orbitals before students have lit a Bunsen burner.
• "Household Chemistry" as a discipline is gone. It got absorbed into food science, materials science, and (depressingly) reduced to TikTok cleaning hacks. The pedagogical insight was lost along with the field.

The thing that's been forgotten isn't a recipe or a remedy — it's an entire curricular philosophy. Snell built a working applications-first chemistry course in 1914, watched it succeed with students who'd never seen a test tube, and wrote down exactly why it worked. A hundred-plus years later, ed-tech companies are charging tuition to rediscover the same principle.