〃No； no；〃 the nurse hastened to explain； 〃she is out somewhere。〃
Dr。 Alton frowned。 〃I told you to take precautions about her diet and…〃
〃Why； certainly；〃 the nurse said； 〃I put it on the chart。 She had dry toast which I fixed myself on an electric toaster and two soft…boiled eggs which I cracked myself。 There was no seasoning at all。 I'm afraid I may have gone to extremes。 I insisted she eat the eggs without salt and I told her that you didn't want her to have any seasoning tonight。〃
〃But you didn't tell her to stay in？〃
〃You didn't tell me to tell her that。〃
〃Is she driving？〃
〃I think George Eagan； the chauffeur； is driving her。〃
〃How long has she been gone？〃
〃I don't know。 I didn't even know she was going。 She didn't e out through here。 There's an exit door from her bedroom to the corridor。 You can see for yourself。〃
The nurse crossed the bedroom to an adjoining bedroom and opened the door。
It was a huge bedroom with rose tapestry； indirect lighting； a king…sized bed with a telephone beside it； half a dozen fortable chairs； an open door to a bathroom and another door leading to the corridor。
〃She didn't tell you she was going out？〃
〃I had no idea of it。〃
〃What time did you give her the toast and eggs？〃
〃About seven o'clock； and I impressed on her that you didn't want her to have anything else。〃
〃What did she say when you told her I suspected an allergy and wanted samples of her hair and her nails？〃
〃She was most co…operative。 She said she certainly would like to find out what was causing the trouble； that somehow she didn't think her troubles were due to what she had eaten。 She suspected some sort of an allergy。〃
Dr。 Alton said； 〃It's important； very important that I see her…You don't know when she'll be back？〃
The nurse shook her head。
〃Nor when she went out？〃
〃No； Doctor； it's just as I told you。 I looked in on her after she had had her supper and she was gone。〃
〃She isn't in the house？〃
〃No； I asked and someone said she had taken the car and gone out。〃
Dr。 Alton walked over to the bedroom and closed the door。 Then he closed the corridor door and turned to Anna Fritch。
〃Did you have any clue as to why I wanted hair and nail scrapings？〃 he asked。
Her eyes avoided his。
〃Did you？〃 Dr。 Alton asked。
〃I wondered。〃
〃Did you suspect？〃
〃The request； coupled with your instructions about diet…Well； I prepared the food myself and didn't let anyone else near it。〃
〃Then you did suspect？〃
〃Frankly； yes。〃
The door from the corridor opened； and Boring Briggs； acpanied by another man； entered the room。
〃I demand to know what's going on！〃 Briggs said。
Dr。 Alton regarded the two men with cold disdain。 〃I am giving instructions to the nurse。〃
〃And you need a lawyer with you for that？〃 Briggs asked。
Dr。 Alton said to Mason； 〃Mr。 Mason； meet the other brother…in…law； Gordon Kelvin。〃
Kelvin； a tall； distinguished…looking man in his late fifties； who gave the impression of being a frustrated actor； advanced a step； bowed slightly from the waist and extended a hand with great dignity。 〃Pleased to meet you； Mr。 Mason；〃 he said； and then added after a moment； 〃and may I ask what you're doing here？〃
Mason said； 〃I came to see Mrs。 Trent。〃
〃This is rather an unusual hour for a call；〃 Kelvin said。
Mason's smile was disarming。 He said； 〃I have been able to order my life along unconventional patterns and no longer refrain from doing what I want to do simply because it is odd； unusual； distinctive or unconventional。〃
The lawyer beamed at the two irate brothers…in…law。
The men exchanged glances。
〃This is no occasion for levity；〃 Kelvin said。
〃I am not being facetious。 I am being accurate；〃 Mason said。
Briggs faced Dr。 Alton； 〃Will you；〃 he asked； 〃once and for all； tell us the reason for this？〃
Dr。 Alton hesitated for a fraction of a second； then said； 〃Yes； I'll tell you the reason for it。 I made a wrong diagnosis on Lauretta Trent's illness。〃
〃You did！〃 Briggs exclaimed in surprise。
〃That's right。〃
〃A mistaken diagnosis？〃 Kelvin asked。
〃Exactly。〃
〃And you admit it？〃
〃Yes。〃
Again； the men exchanged glances。
〃Would you kindly tell us the real nature of the illness？〃 Briggs asked。
〃We want to know if it's 。 。 。 serious；〃 Kelvin supplemented。
〃I dare say you do；〃 Dr。 Alton said dryly。
Briggs said； 〃Our wives have been out； but are expected back at any moment。 They will perhaps be in a little more favorable position when it es to 。 。 。 well 。 。 。 to getting information from you。〃
〃Demanding an explanation；〃 Kelvin supplemented。
〃All right；〃 Dr。 Alton said angrily； 〃I'll give it to you。 I made a mistake in diagnosis。 I thought your sister…in…law was suffering from a gastroenteric disturbance induced by eating food that was tainted。〃
〃And now you say that was not the correct diagnosis？〃 Briggs asked。
〃No；〃 Dr。 Alton said。 〃It was not。〃
〃What was the correct diagnosis？〃 Gordon Kelvin asked。
〃Someone had deliberately given her arsenic trying to poison her；〃 Dr。 Alton said。
In the shocked silence that followed； two women came bustling into the room； two women who looked very much alike； women who spent much time and money in beauty shops and had evidently just been at one that day。
They were girdled so heavily they had an awkward stiffness of motion； their chins were held high and their hair was beautiful。
Dr。 Alton said； 〃Mrs。 Briggs and Mrs。 Kelvin； Mr。 Mason； and Miss Street； Mr。 Mason's secretary。〃
Mrs。 Kelvin； perhaps a few years older than her sister； but with keen inquisitive eyes； immediately took the initiative。 〃What's all this about？〃 she asked。
Boring Briggs said； 〃Dr。 Alton has just told us he made a mistake in diagnosing Lauretta's illness； that it wasn't food poisoning at all； it was arsenic poisoning。〃
〃Arsenic！〃 Mrs。 Kelvin exclaimed。
〃Bosh and nonsense！〃 Mrs。 Briggs snapped。
〃He seems certain；〃 Gordon Kelvin said； 〃apparently〃
〃Bosh and nonsense！ If the man's made one mistake； he could make two。 Personally； I think Lauretta needs another doctor。〃
Dr。 Alton said dryly； 〃You might speak to Lauretta about it。〃
Boring Briggs said。 〃Now； look here； is all this going to get into the newspapers？〃
〃Not unless you let it get into the papers；〃 Dr。 Alton said。
〃You're municating with the police？〃
〃Not as yet；〃 Mason said。
There was a moment's silence。
Mason went on calmly； 〃To a large extent； it's up to you folks。 I take it this is a situation you wouldn't want to have publicized。 I can also well realize that you have received the information with feelings of mingled emotion； but we are now facing facts； and one doesn't argue with facts。〃
〃How do you know they are facts？〃 Briggs demanded。
Mason met his eyes and said coldly； 〃Laboratory facts。 Positive evidence。〃
〃You can't get evidence of something that's past that way；〃 Briggs said。
Mason said； 〃Something that isn't generally known is that arsenic has an affinity for fingernails and hair。 Once it gets in the system； it reaches the nails and the hair and lasts for a long； long time。 Late this afternoon； Dr。 Alton had samples taken of Lauretta Trent's hair and her fingernails。 I； personally； had an analysis made by a laboratory that is highly petent。
〃The answer was arsenic poisoning。 In the hair； they were able to trace the intervals of arsenic poisoning。
〃Now then； Dr。 Alton is Lauretta Trent's personal physician。 He's seen fit to disclose this information。〃
〃Because；〃 Dr。 Alton said； 〃I'm trying to save the life of my patient。 I think I have treated her long enough to understand something of her temperament。 The minute I tell her that she has been a victim of arsenic poisoning； things are going to start happening around here。〃
〃I'll say they are；〃 Mrs。 Briggs said。 〃Lauretta will hit the ceiling。〃
〃One dose of arsenic poisoning；〃 Dr。 Alton went on； 〃may be more or less accidental； two doses indicate a deliberate attempt at homicide。 Apparently； there have been three。〃
His announcement was greeted with silence。
After a moment； Mrs。 Kelvin said； 〃These tests； are they absolute…that is； could there be any mistake？〃
〃They're absolute；〃 Mason said。 〃There can be no mistake。〃
Mrs。 Briggs said； 〃That first time she got sick was after she