In the conversion of saliva into poison, one might suppose that a fixed process took place.

In  ^{在将...转化为...的过程中（介词 in 表时间）}

• In the organization of industrial life the influence of the factory upon the physiological and mental state of the workers has been completely neglected.
•  He walked two hundred and sixty miles in eight days.  ^{他在八天里走了二百六十英里。}
• The economy was in trouble.  ^{经济陷于困境。}

the conversion of ... into ... ^{转化 ... 名词短语与动词搭配介词相同}

• the conversion of a barn into a house ^转变用途
• the conversion of pounds into dollars ^兑换
• In the conversion of saliva into poison ^{在...转换过程中}

take place ^{v.sth. happens that is planned or arranged（计划之中的事情）发生}

• I don't think it will take place. ^{我想那种事是不可能发生的。}
• Where is the meeting taking place?
• The wedding will take place at St. Andrew's church.

It did not; some snakes manufactured a poison different in every respect from that of others, as different as arsenic is from strychnine, and having different effects.

be different from … ^与…不同 

• His world seemed so different from mine. ^{他的生活圈子与我的似乎是那么的不同。}
• London was different from most European capitals. ^{伦敦与大多数的欧洲首都城市不同。}
• The new methods are radically different from the old. ^{新的方法迥然不同于旧的方法。}
• Her background is markedly different from her husband's. ^{她的背景和她丈夫的截然不同。}

in every respect / aspect / way ^{在每个方面}

• The situation is different in every respect from last year.
• The two approaches are similar in many aspects.

that of ... ^{（代指前文的同类名词）...的那个}

• His function is analogous to that of a judge, ...
• The plotline is similar to that of many other movies. ^{该主要情节与其他众多电影的主要情节相似。}
• Modern music is often considered inferior to that of the past. ^{现代音乐常被认为不如过去的。}

as different as A is from B ^{就像 A 与 B 不同一样（用来补充说明不同程度）}

Chinese culture is different in every respect from that of America, as different as the giant panda is from the bald eagle. ^{中国文化在各个方面都与美国文化不同，就像大熊猫与白头鹰不同一样}

One poison acts on the nerves, the other on the blood. ^独立主格

act on ... ^{对...有效；作用于... (act v.to have an effect or use 有某种效果或作用)}

• Alcohol acts on the brain.
• Disinfectants act on bacteria in two main ways.

the other (acting) on the blood ^{另一个作用于血液（独立主格）}

• One poison acts on the nerves, the other (acting) on the blood.