1. If the mitral Cuspidate valves do not prevent the egress of fuliginous vapours to the lungs, how should they oppose the escape of air? On the Motion of the Heart and Blood in Animals

2. For in addition for Caliginous we have such murky specimens as tenebrous ("shut off from the light"), fuliginous ("dark, having the color of soot"), opacous ("opaque; lacking illumination"), and carbonous ("brittle and dark or almost black in color")