The capillary theory may not, probably does not, play part in every case. It would seem that a stemonitis, for example, must owe the rise of the spore-plasm to the play of different machinery. _Brefeldia_, p. 154 above, may offer suggestion. g. On page two of the introductory section of this volume mention is made of the variety of colors shown in the vegetative phases of the organisms we study. This fact is patent to all observers; but the identity of the plasmodium making the display must be ascertained by painstaking or prolonged and repeated observations. This for the reason that, as I am convinced, only in comparatively few cases is the color unchanged during the life-history of a given fructification. It may sometimes change from hour to hour as development proceeds. The color designated in the descriptive pages of this work is presumably, unless as otherwise set out, that immediately preceding that of the maturing fruit. As suggestive, and as, it is hoped, contributory to better knowledge of this phase of our subject a list of species is here subjoined as presented by my colleague, Professor Morton E. Peck of Oregon, who has given unusual attention to this particular investigation. SPECIES PLASMODIUM COLORS _Physarum sinuosum_ light grey, nearly white, ivory white _Physarum serpula_ greenish-yellow; yellow _Physarum virescens_ pale greenish-yellow; yellow _Physarum cinereum_ watery grey, becoming white; pallid _Physarum didermoides_ watery grey, becoming white; blue-white _Physarum notabile_ pure white _Physarum globuliferum_ greenish-yellow; yellow _Physarum leucopus_ light grey _Physarum pulcherrimum_ dark red _Physarum flavicomum_ greenish or brownish yellow _Physarum viride_ clear yellow _Physarum wingatense_ at first grey, then pure white _Badhamia orbiculata_ pale yellow, passing to white _Physarella oblonga_ brilliant yellow _Mucilago spongiosa_ watery grey, then white _Didymium crustaceum_ white _Didymium squamulosum_ pale grey, watery white _Diderma floriforme_ grey tinged with yellow _Stemonitis fusca_ white passing through blue to black _Stemonitis smithii_ green to yellow to reddish purple _Comatricha longa_ white, cream-yellow, reddish purple to dusky _Comatricha irregularis_ white _Comatricha nigra_ white _Comatricha typhoides_ bluish white _Diachaea splendens_ pure white _Enerthenema papillatum_ colorless or greenish _Reticularia lycoperdon_ white _Dictydiaethalium plumbeum_ colorless, pink, salmon, rose, orange, chocolate brown _Lindbladia effusa_ brown, lead-colored