Is this correct: However, in the 1300s, as preventive measures have become discovered, most doctors recommended these methods or purifying the air to prevent plague: 1. Burn richly scented incense. 2. Fill the house with flowers. 3. Sprinkle the floors with vinegar. 4. Request that doctors must wear a bird mask with perfume in the beak.

I apologize. It seems I have accidentally mislabeled my question.

What is your question?

Is the sentence I have written above grammatically correct?

The only change I recommend is to change the tense in this sentence.

as preventive measures have become discovered,

as preventive measures had become discovered,

Thank you.

You're welcome.

The information you provided contains some inaccuracies. During the 1300s, when the bubonic plague or "Black Death" was prevalent, the understanding of the disease and preventive measures were quite limited. However, some practices were indeed recommended at the time in an attempt to prevent the spread of the plague. Here's a breakdown of each method you mentioned:

1. Burn richly scented incense: It is true that burning incense was one of the preventive measures suggested during the plague. The belief was that the pleasant fragrance would cleanse the air and drive away the disease. However, it is important to note that burning incense alone would not have been sufficient to prevent the spread of the plague.

2. Fill the house with flowers: This particular method is not recorded as a widely recommended measure during the plague. While the idea behind it might have been to mask unpleasant odors, it is not considered a significant preventive measure against the disease.

3. Sprinkle the floors with vinegar: This method is not commonly mentioned in historical records as a preventive measure for the plague. Vinegar has been used for various purposes throughout history, but its effectiveness in preventing the disease is not supported by scientific evidence.

4. Request that doctors wear a bird mask with perfume: The use of bird-like masks by doctors during the plague is accurate. These masks, also known as "beak masks" or "plague doctor masks," were designed with long beaks filled with herbs and perfumes. The belief at the time was that the herbs and perfumes would purify the air and protect the doctors from the disease. However, it is worth noting that the understanding of how the plague spread and the effectiveness of these masks was limited at the time.

In summary, while some of the methods you mentioned were indeed recommended during the plague, it is important to distinguish between what historical records support and what might be speculative or misunderstood.