Noah’s Ark and the creation of the species rank

This is a section of my forthcoming revision to Species, presented here for comments that I can steal – umm, I mean for peer commentary. At this point in our narrative, we still do not have a uniquely biological notion of species, nor of a fixed rank in logic. As species concepts evolved, at some point both of Read More…

Are species life forms?

This is a section of my forthcoming revision to Species, presented here for comments that I can steal – umm, I mean for peer commentary. The philosophical ideas and terms of Wittgenstein have played an interesting and underappreciated role in the species debate: we saw Beckner appeal to family resemblance predicates, and Pigliucci revive that, Read More…

A nineteenth century view on classification

The principle upon which I understand the Natural System of Botany to be founded is, that the affinities of plants may be determined by a consideration of all the points of resemblance between their various parts, properties, and qualities; that thence an arrangement may be deduced in which those species will be placed next each Read More…

Speciation – A brief history: The late eighteenth century

After Linnaeus had settled on the older mechanism of hybridisation of genera with other genera or with varieties formed by geographical conditions as the cause of new species, the topic began to pick up speed. Hybridisation remained the usual method as late as the 1830s (e.g., in Lindley) but two developments were crucial in the Read More…

Speciation – a brief history: Linnaeus

One of the fundamental aspects of evolution is speciation. This is the process by which more species come into being, and there are many different definitions and mechanisms that have been proposed by biologists in the last couple of centuries. I aim to write an occasional series on what it is supposed to be at Read More…

The origins of “speciation”

As I do some research on the history of speciation theories, I came across this, which is perhaps the original coining of the term: Evolution is a process of organic change and development, universal and continuous, and due to causes resident in species. Speciation, to give the other process a name, is the origination or Read More…

Books I am reading/reviewing

Despite marking scores of essays, after having taught a subject intensive, and preparing various papers, I get to review some books. This means reading them, familiarising myself with the technical literature, and so on. So I thought I’d do a brief summary of them for you now: The first is this: M. A. Khalidi, Natural Categories Read More…