Both poisons are unpleasant, but by far the more unpleasant is the blood poison.

这两种毒液都很可怕，但溶血性毒液尤其厉害。

Be that as it may, the nerve poison does its business with man far more quickly than the blood poison.

不过，神经毒辣液比溶血性毒液在人身上起作用快得多。

Vipers (adders) and rattlesnakes manufacture the blood poison, which is known as haemolytic.

毒蛇（加法器）和响尾蛇制造血毒，这被称为溶血性。

It is said that the nerve poison is the more primitive of the two, that the blood poison is, so to speak, a newer product from an improved formula.

据说，神经毒液在两种毒液中是较为原始的一种，而溶血性毒液，打个比方说，是根据改良配方生产的一种较新的产品。