Full Idea
In the physical sciences the particular observations and experimental results are usually orderable, while in the biological sciences it is the classes of organism which are ordered, not the particular organisms.
Gist of Idea
In physical sciences particular observations are ordered, but in biology only the classes are ordered
Source
Rom Harré (Laws of Nature [1993], 3)
Book Reference
Harré,Rom: 'Laws of Nature' [Duckworth 1993], p.67
A Reaction
Harré is interesting on the role of ordering in science. Functions can be defined by an order. Maths feeds on orderings. Physics, he notes, focuses on things which vary together.