AbstractUsually one reads that after the foundation of scientific journals the journal article took the place of scientific correspondence. It is shown here that periodicals did not replace the letter, but only supplemented it. Norms were developed for the journal article such that (in short) only the „context of justification”︁, not the „context of discovery”︁, could be discussed. Any scholar who wanted to participate in the „discussion out of which science arises”︁ had to resort to the letter; the reading of journals did not suffice. — This circumstance is illustrated in particular by the example of quantum theory an