Or rather, I'd guess that they had some idea of "white blood cells" because they certainly had germ theory (which is an essential element of vaccination). But, like with the Bokanovsky system, the issue here is a lack of understanding of fetal development.
It's just something you have to forgive because they didn't know.
Re: Vaccination
Date: 2017-12-14 07:15 pm (UTC)Or rather, I'd guess that they had some idea of "white blood cells" because they certainly had germ theory (which is an essential element of vaccination). But, like with the Bokanovsky system, the issue here is a lack of understanding of fetal development.
It's just something you have to forgive because they didn't know.