PLUTONIC a.
volcanic heat and other subterranean forces under pressure. -- Plutonic rocks (Geol.), granite, porphyry, and some other igneous rocks, supposed to have consolidated from a melted state at a great depth from the surface. Cf. Intrusive rocks, under Intrusive. -- Plutonic theory. (Geol.) See Plutonism.…
PNEUMOGASTRIC a.
The pneumogastric nerve. Pneumogastric nerve (Anat.), one of the tenth pair of cranial nerves which are distributed to the pharynx, esophagus, larynx, lungs, heart, stomach, liver, and spleen, and, in fishes and many amphibia, to the branchial apparatus and also to the sides of the body.
PRIMARY a.
posed to have been first formed, being crystalline and containing no organic remains, as granite, gneiss, etc.; -- called also primitive rocks. The terms Secondary, Tertiary, and Quaternary rocks have also been used in like manner, but of these the last two only are now in use. -- Primary salt (Chem.), a salt derived…
QUICHUAN a.
e Indians are short, but heavy and strong. They are brachycephalic and of remarkably low cranial capacity. Nevertheless, they represent one of the highest of native American civilizations, characterized by agricultural, military, and administrative skill rather than by science or literature, although they were adept po…
RADIUM n.
metallic element found (combined) in minute quantities in pitchblende, and various other uranium minerals. Symbol, Ra; atomic weight, 226.4. Radium was discovered by M. and Mme. Curie, of Paris, who in 1902 separated compounds of it by a tedious process from pitchblende. Its compounds color flames carmine and give a ch…
SCAGLIOLA n.
th glue, the surface of which, while soft, is variegated with splinters of marble, spar, granite, etc., and subsequently colored and polished.
SKULL n.
The skeleton of the head of a vertebrate animal, including the brain case, or cranium, and the bones and cartilages of the face and mouth. See Illusts. of Carnivora, of Facial angles under Facial, and of Skeleton, in Appendix.