"Their universal presence in the cell, coupled with the known properties of bacteria, appear to indicate that mitochondria represent the end adjustment of a fundamental biologic process. The establishment of intimate microsymbiotic complexes has been designated "symbionticism" by the author…."
— Ivan Wallin (1883-1969)
"It is a rather startling proposal that bacteria, the organisms which are popularly associated with the disease, may represent the fundamental causative factor in the origins of species."
— Ivan Wallin (1883-1969)
Natural Selection, by itself, is not sufficient to determine the direction of organic evolution.... Natural Selection can only deal with that which has been formed; it has no creative powers. Any directing influence that Natural Selection may have in organic evolution, must, in the nature of the process, be secondary to some other unknown factor.
— Ivan Wallin (1883-1969)
Symbionticism, then is proposed as the fundamental factor or the cardinal principle involved in the origin of species.
— Ivan Wallin (1883-1969)