I've been doing a little casual research on prussic acid. I've read some sources which were available in the 1890's, and some well before, which state in a nutshell that.."oil of almonds, used by confectioners, contains prussic acid"...
I've found some recipes for cakes and other goodies that use oil of almonds. One article in a medical journal published in 1867 demanded the Legislature should interfere in the sale of oil of bitter almonds due to the fact testing proved it could easily poison or cause death in their lab rats. Most of the articles state that the oil is purified in an attempt to remove the lethal substance.
When the amount was not sufficient to cause death, it still could cause serious illness in the person who ingested it. So should Dr. Bowen have taken Abby's fear about being sick as a result of baker's cream cakes a little more seriously? Even if this wasn't actually the case, and Lizzie was trying to poison them on purpose, her fear was at least in the realm of possibility.
When reading the medical books so far the testing methods for poison such as prussic acid has involved removal of the stomachs, much the same as the Borden stomachs were removed.
What to Do in Cases of Poisoning published in 1884.
Almond Flavour - Spirits of Almonds- Essence of Peach Kernels.
Consists of one part of Essential oil of Almonds and seven of spirits. About the same strength as Prussic Acid, and largely used by cooks for flavoring pastry, blanc mang, & c. Found in every kitchen.
Death from thirty drops ; poisoning in a child from eating tapioca pudding flavoured with it.
For symptoms and treatment, see prussic acid.
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A few poisons are discussed in this book.
The Encyclopedia of Household Information: A Compendum of Facts For Easy Reference Which Shall Constitute A Guide to Every Department of Social and Domestic Economy. A Manual for Every Home. Published 1890 by D.R. Ingersoll & Co.
Prussic Acid. Oil of Bitter Almonds, laurel water, cyonide of potassium, etc. , contain prussic acid. It is a deadly poison, and if a large quantity is taken, death takes place instantly, but smaller amounts occassion giddiness, loss of sight and fainting. Prussic acid, is the most deadly poison known. One drop of prussic acid would probably cause instantaneous death. When not instantly fatal, this poison occassions a sudden loss of sense, locked jaw, and difficult and rattling respiration, coldness of the extremities, small pulse, dialation of the pupils, and convulsions. There is a smell of bitter almonds proceeding from the mouth, and in the contents of the stomach, which may aid in forming an opinion on the nature of the case. Diluted water of ammonia is considered the best counter poison which can be used against this acid, otherwise its effects are to be combatted according to the general principles heretofore laid down."
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