# The Arsenic Test explained — Strong Poison

> Chapter companion for Strong Poison by Dorothy L. Sayers.

## What happens

Wimsey and Parker review the evidence against Norman Urquhart, including his financial motives and lies about Mrs. Wrayburn's will. Bunter performs a Marsh test on powder from Urquhart's envelope, confirming it contains arsenic. Despite this, Parker notes they still lack proof of opportunity for administration. Wimsey stays up late studying toxicology and trial records, eventually deducing how the murder was done.

## Themes in this chapter

### Intellect and Detection

Wimsey and Parker methodically analyze evidence, and Wimsey's late-night study of toxicology and trials leads to a breakthrough.

### Deception and Appearance

Urquhart's lies about the will and his false draft document are central to the case against him.

### Poison and Arsenic as Metaphor

The Marsh test confirms arsenic in Urquhart's possession, linking the physical poison to the metaphorical corruption of his character.

## Character check-ins

### Lord Peter Wimsey

Leads the discussion of evidence, oversees the arsenic test, and stays up all night studying to solve the murder method.

### Chief Inspector Parker

Summarizes the case against Urquhart, acknowledges the arsenic evidence, but insists on proving opportunity for a jury.

### Bunter

Performs the Marsh test for arsenic on the powder from Urquhart's envelope, and later realizes the solution to the murder method.

### Miss Murchison

Provides the envelope containing arsenic from Urquhart's office, and witnesses the test results.

### Freddy Arbuthnot

Present during the arsenic test, makes light-hearted comments about the proceedings.

### Mr. Norman Urquhart

Discussed as the prime suspect; evidence of his financial misdeeds and lies about the will is reviewed.

## Key lines

> Are you convinced, Charles?

Wimsey asks Parker if he is now persuaded of Urquhart's guilt.

_Wimsey seeks Parker's professional agreement after presenting the evidence._

> I know now how it was done.

Wimsey announces he has figured out the method of the murder.

_After a night of study, Wimsey achieves a key insight into the crime._

> It proves that Urquhart has arsenic in his possession

The test shows Urquhart had access to arsenic.

_Parker acknowledges the significance of the forensic evidence._

## Links

- HTML: https://www.betterreads.online/discover/strong_poison_se/chapters/xx
- Book: https://www.betterreads.online/discover/strong_poison_se
- All chapters: https://www.betterreads.online/discover/strong_poison_se/chapters