Let’s look into this.
https://books.google.com/ngrams/graph?content=pretest%2Cpretests&year_start=1800&year_end=2019 . . .
It looks like there are some early examples—but, when we go in search of them, we find “pretexts” and “protests”, which OCR has misidentified as “pretests”. The ngram should really be showing a flat line until after 1920.
The word in Vyse’s manuscript is in my estimation “Products”.
|Was “pretests” a word in 1837?||102||Martin Stower||14-Jul-21 21:00|