Of these three essential factors, space might be said to be one with which biogeography is primarily concerned. However space necessarily interplays with time and form, therefore the three factors are as one of biogeographic concern. — Leon Croizat Copy Share Image
Let us suppose that we have laid on the table... [a] piece of glass... and let us homologize this glass to a whole order… — Leon Croizat Copy Share Image
Of these three essential factors, space might be said to be one with which biogeography is primarily concerned. However space necessarily interplays with time… — Leon Croizat Copy Share Image
![“Let us suppose that we have laid on the table... [a] piece of glass... and let us homologize this glass to a whole order of plants or birds. Let us hit this glass a blow in such a manner as but to crack it up. The sectors circumscribed by cracks following the first blow may here be understood to…” quote by Leon Croizat](https://sms4smile.com/quotes/img-quotes/75f/leon-croizat-94198_bird_let-us-suppose-that-we-have-laid-on-the_1001009.jpg)