书城教材教辅科学读本(英文原版)(套装1-6册)
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第142章 第二册(59)

"This curd," Fred added, "is the part of the milk which is able to make flesh. You know, of course,that the cow"s milk is meant to feed her little calf, till it is able to look after itself. It is the curd of the milk that builds up the growing body of the little calf.

"Did you know, Norah, that cheese is made from these curds of milk?"SUMMARY

The cream of milk is a mass of tiny cells or bags of fat. The little bags are broken in the churn, and the fat in them forms butter. The curd of milk is made into cheese.

Lesson 27

Wrought Iron

"Teacher showed us some things made of wrought iron today," said Willie. "They are not at all like the cast-iron things we were talking about.