Dear Sir

My friend D^r Lauder Brunton told me today that he thought you would be glad to have some Cobra poison for an experiment¹   I therefore take the liberty of enclosing you a small quantity of that very active agent. It has recently been sent to me from Calcutta—and is quite recent. I think you will find $\frac{1}{4}$ of a grain dissolved in water injected under the skin sufficient to destroy a rabbit. That quantity injected into the jugular vein of a large rabbit today killed a large rabbit in 60 Seconds. A more diluted solution will probably answer the purpose you require.

I daresay you know that this is a subject I have been investigating in India—and since I returned to England have been continuing the enquiry in conjunction with D^r Brunton²

Believe me Your’s very faithfully | J. Fayrer.