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       The following were the results obtained:—

Animal. Weight. Amount of venom per kilo. Amount of serum. Result.
Rabbit 1 1,480 grammes 0.5 milligramme 1 c. c. Found dead after 18 hours
,, 2 1,680 „ 0.5 „ 2 c. c. Ditto.
,, 3 1,400 „ 0.5 „ 3 c. c. Ditto.
,, 4 1,510 „ 0.5 „ 4 c. c. Ditto.
,, 5 1,28o „ 0.5 „ Nil. Ditto.
(Control.)        

       B. In the second series of experiments a different sample of venom was used.
Of this sample it was found that the minimum amount which caused intravas-
cular thrombosis, when injected intravenously into a rabbit, was 0.2 milligramme
per kilo. A single experiment was made with this sample. The test dose used
was 0.6 milligramme per kilo., viz., three times the amount which could cause
intravascular thrombosis.

       The technique was as follows:—5 c. c. of serum were injected into the
marginal vein of one ear: five minutes afterwards the test dose of venom
(0.1% solution) was injected into the marginal vein of the other ear.

       The following was the result obtained:—

Animal. Weight. Amount of venom per kilo. Amount of serum. Result.
Rabbit 1,380 grammes 0.6 milligramme 5 c. c. Died in 1½ minutes.

       From these series of observations it is therefore evident that the serum of a
horse immunised with the venom of Hoplocephalus curtus has no power to
neutralise the venom of Daboia Russellii.

Notes and references.

       1. The information used in this paper concerning the classification of the
poisonous snakes was taken from ' Fauna of British India—Reptilia and
Batrachia' by Boulenger.

       2. Calmette: ' Le venin des Serpents ': Paris, 1896. ' Notice sur le Sérum
Antivenimeux et sur le Traitement des Morsures de Serpents ': Lille, 1901.

       3. ' Journal of Pathology and Bacteriology ': Edinburgh and London: 1902,
Vol. VIII, page 1.

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