"To me, however, who confide more in the eye of reason than in that of sense, and would rather form opinions from analogy than from the imperfect evidence of sight, it seems too hasty an inference to conclude that, in the minute animals, there are no vessels nor other organization because we cannot see them, or that polypes are actually devoid of vessels, and merely of the structure described, because we can discern no other. Were it, however, really so, such facts would then only show with how little and with what various organization life could accomplish its principal functions of assimilation, formation, and multiplication. Who has seen the multitudinous distribution of absorbing vessels, and all the other organization, which doubtless exists in the vitreous humour of the eye, than which no glass ever appeared more transparent or more seemingly inorganic[61]? How strange is it that anatomists, above all other members of the community of science, should hesitate to admit the existence of what they cannot discern, since they, more than all the rest, have such constant assurance of the imperfection and fallibility of sight[62]?" REITERATION OF AN IMPORTANT AXIOM, QUITE NECESSARY AT THIS TIME TO THE CHEMICAL PHYSIOLOGISTS. "Our physiological theories should be adequate to account for all the vital phenomena both in health _and disorder_, or they can never be maintained as good theories[63]." OF RESPIRATION. CAUTIOUS REASONING. HAD ALL REASONED THUS, WE MIGHT HAVE ESCAPED MUCH UNSOUND THEORIZING ON THIS IMPORTANT PROCESS.