Chapter XXI.

What Time is Required to Shape the Parts of Animals in the Womb.

Empedocles believes, that the joints¹ of men begin to be formed from the thirty-sixth day, and their shape is completed in the nine and fortieth. Asclepiades, that male embryos², by reason of a greater natural heat, have their joints begun to be formed in the twenty-sixth day — many even sooner — and that they are completed in all their parts on the fiftieth day; the parts of the females are articulated in two months, but by the defect of heat are not consummated³ till the fourth; but the members of brutes⁴ are completed at various times, according to the commixture of the elements of which they consist.

1 joints   

接头( joint的名词复数 )； 关节； 公共场所（尤指价格低廉的饮食和娱乐场所） （非正式）； 一块烤肉 （英式英语）

参考例句：

• Expansion joints of various kinds are fitted on gas mains. 各种各样的伸缩接头被安装在煤气的总管道上了。
• Expansion joints of various kinds are fitted on steam pipes. 各种各样的伸缩接头被安装在蒸气管道上了。

2 embryos   

n.晶胚；胚，胚胎( embryo的名词复数 )

参考例句：

• Somatic cells of angiosperms enter a regenerative phase and behave like embryos. 被子植物体细胞进入一个生殖阶段，而且其行为象胚。 来自辞典例句
• Evolution can explain why human embryos look like gilled fishes. 进化论能够解释为什么人类的胚胎看起来象除去了内脏的鱼一样。 来自辞典例句

3 consummated   

v.使结束( consummate的过去式和过去分词 )；使完美；完婚；（婚礼后的）圆房

参考例句：

• The marriage lasted only a week and was never consummated. 那段婚姻仅维持了一星期，期间从未同房。
• We consummated an agreement after a year of negotiation. 经过一年的谈判，我们达成了协议。 来自《简明英汉词典》

4 brutes   

兽( brute的名词复数 )； 畜生； 残酷无情的人； 兽性

参考例句：

• They're not like dogs; they're hideous brutes. 它们不像狗，是丑陋的畜牲。
• Suddenly the foul musty odour of the brutes struck his nostrils. 突然，他的鼻尖闻到了老鼠的霉臭味。 来自英汉文学