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- I take it for granted that you do not wish to hear an echo from the pulpit nor from the theological class-room. — Asa Gray
- I am sufficiently convinced already that the members of a profession know their own calling better than anyone else can know it. — Asa Gray
- This substance, which is manifold in its forms and protean in its transformations, has, in its state of living matter, one physiological name which has become familiar, that of protoplasm. — Asa Gray
- Your candor is worth everything to your cause. It is refreshing to find a person with a new theory who frankly confesses that he finds difficulties, insurmountable, at least for the present. — Asa Gray
- But it was soon ascertained that this quaternary matter of the animal body was chemically the same in the plant, was elaborated there, and only appropriated by the animal. — Asa Gray
- Why is it not just as likely that there were as many small general nearly at first as now, and as great a disproportion in the number of their species? — Asa Gray