1. Glass-stoppered conical flasks of at least 200 ml capacity.

2. The vessels are tightly stoppered and then agitated at # °C

3. Glass-stoppered conical flask of at least 200 ml capacity.

4. (i) Glass-stoppered conical flask of at least 200 ml capacity.

5. The vessels are tightly stoppered and then agitated at 20 °C.

6. The vessels are tightly stoppered and then agitated at 30 °C.

7. To the specimen contained in the glass-stoppered conical flask of at least 200 ml capacity, add 100 ml glacial acetic acid per gram of specimen.

8. The narrow mouth of an Erlenmeyer also allows for a flask to be more easily covered during the cooling stage, or even potentially stoppered for long Crystallizations

9. A system for use with evacuated, rubber stoppered sample tubes (3) and double-ended needles (1) facilitates blood collecting operations and prevents accidental punctures from contaminated needles after use.