This substance, which is manifold in its forms and protean in its transformations, has, in...#Asa Gray
The former conviction that these two kingdoms were wholly different in structure, in function, and...#Asa Gray
The best opinion now is, that there are multitudinous forms which are not sufficiently differentiated...#Asa Gray
Many years ago it was taught that plants and animals were composed of different materials:...#Asa Gray
It was implicitly supposed that every living thing was distinctively plant or animal; that there...#Asa Gray
It was always understood that plants and animals, though completely contrasted in their higher representatives,...#Asa Gray
Is it philosophical, is it quite allowable, to assume without evidence from fossil plants that...#Asa Gray
