Send Me Your Best Quote About Isolation & Purification of a "Virus"

Isolate a Quote from a Scientific Paper Claiming the Discovery of a “Virus”, Copy & Paste it in the Comments and Include a Link to the Paper, and I will analyze that quote and show you it does not describe any actual isolation & purification.

1918 Study Where They tried to Infect Healthy People But Failed:
https://quod.lib.umich.edu/f/flu/3750flu.0016.573/--experiments-upon-volunteers-to-determine-the-cause-and-mode?view=image&seq=3&size=125