The course of development consists simply in this; that in each generation the two parental traits appear, separated and unchanged.

发展过程简单来说就是：在每一代中，两个亲本性状都会出现，分离且不变。

It is now clear that the hybrids form seeds which have the one or the other of the two differentiating characters.

现在已经清楚，杂种形成的种子具有两个分化性状中的一个或另一个。

Experiments on plant hybridization require the most careful attention and great patience.

植物杂交实验需要最仔细的关注和极大的耐心。

Nature tends to produce constancy in all her works, but she does not always succeed.

大自然倾向于在她所有的作品中产生恒常性，但并不总是成功。

The uniformity of the hybrids in the first generation, the dissimilarity in the second, are facts which cannot escape the attention of an accurate observer.

第一代杂种的同一性，第二代的不相似性，是精确观察者无法忽视的事实。

To live without experiencing some of the most beautiful relations life affords is not to have lived at all.

生活中没有体验过一些最美好的关系，就等于根本没有生活过。

The development of the vital forms under the influence of external conditions is a subject of the highest importance.

外部条件影响下生命形式的发展是一个极其重要的课题。

It requires indeed some courage to undertake a labor of such far-reaching extent.

确实需要一些勇气来承担如此影响深远的工作。

The value and utility of any experiment are determined by the fitness of the material to the purpose for which it is used.

任何实验的价值和效用都取决于材料是否适合其使用的目的。

My scientific studies have afforded me great satisfaction; and I am convinced that it will not be long before the whole world acknowledges the results of my work.

我的科学研究给我带来了极大的满足；我深信，用不了多久，全世界都会承认我的工作成果。