As for the experiment, although we have thrice attempted it, it hath not well succeeded; for though we fed them with Milk, Bran, Cheese, etc., the females always died before the young ones were mature for this eruption; but rest sufficiently confirmed in the experiments of worthy enquirers. Wherein to omit the ancient conviction of _Apollonius_, we shall set down some few of Modern Writers. [SN: _That Vipers exclude their young ones by an ordinary passage, as other viviparous creatures._] The first, of _Amatus Lusitanus_ in his Comment upon _Dioscorides_, _Vidimus nos viperas prægnantes inclusas pixidibus parere, quæ inde ex partu nec mortuæ, nec visceribus perforatæ manserunt._ The second is that of _Scaliger_, _Viperas ab impatientibus moræ fœtibus numerosissimis rumpi atque interire falsum esse scimus, qui in Vincentii Camerini circulatoris lignea theca vidimus, enatas viperellas, parente salva._ The last and most plain of _Franciscus Bustamantinus_, a _Spanish_ Physitian of _Alcala de Henares_, whose words in his third _de Animantibus Scripturæ_, are these: _Cum vero per me et per alios hæc ipsa disquisissem servata Viperina progenie, etc._: that is, when by my self and others I had enquired the truth hereof, including Vipers in a glass, and feeding them with Cheese and Bran, I undoubtedly found that the Viper was not delivered by the tearing of her bowels; but I beheld the young ones excluded by the passage of generation, near the orifice of the seidge. Whereto we might also add the ocular confirmation of _Lacuna_ upon _Dioscorides_, _Ferdinandus Imperatus_, and that learned Physician of _Naples_, _Aurelius Severinus_.