in short, all those trees known under the name of gum-trees or iron-bark trees in Australia, belong to this family of the myrtaceæ, which contains forty-six genera and thirteen hundred species!"
The lad was allowed to run on, and he delivered his little botanical lecture with great animation. Cyrus Harding listened, smiling, and Pencroft with an indescribable feeling of pride. "Very good, Herbert," said Pencroft, "but I could swear that all those useful specimens you have just told us about are none of them giants like these!"
"That is true, Pencroft."
"That supports what I said," returned the sailor, "namely, that these giants are good for nothing!"
"There you are wrong, Pencroft," said the engineer; "these gigantic eucalypti, which shelter us, are good for something."
"And what is that?"
"To render the countries which they inhabit healthy. Do you know what they are called in Australia and New Zealand?"
"No, captain."
"They are called 'fever trees.'"
"Because they give fevers?"
"No, because they prevent them!"
"Good. I must note that," said the reporter.
"Note it then, my dear Spilett; for it appears proved that the presence of the eucalyptus is enough to neutralize miasmas. This natural antidote has been tried in certain countries in the middle of Europe and the north of Africa, where the soil was absolutely unhealthy, and the sanitary condition of the inhabitants has been gradually ameliorated. No more intermittent fevers prevail in the regions now covered with forests of the myrtaceæ. This fact is now beyond doubt, and it is a happy circumstance for us settlers in Lincoln Island."
"Ah! what an island! What a blessed island!" cried Pencroft. "I tell you, it wants nothing—unless it is———"
"That will come, Pencroft, that will be found," replied the engineer; "but now we must continue our voyage and push on as far as the river will carry our boat!"
The exploration was therefore continued for another two
