SCIENCE 



A WEEKLY JOURNAL DEVOTED TO THE ADVANCEMENT OF SCIENCE, PUBLISHING THE 



OFFICIAL NOTICES AND PROCEEDINGS OF THE AMERICAN ASSOCIATION 



FOR THE ADVANCEMENT OF SCIENCE, 



Friday, August 10, 1906. ^^^^ NATURE AND ORIGIN OF VOLCANW 



■'^ HEAT. 



CONTENTS. The hypothesis of a molten or more or 



The Nature and Origin of Volcanic Heat: less fluid interior, as possessed by the earth, 



m. Elihu Thomson 161 ^^^y now be said to have been abandoned. 



The Geographical Distribution of the Student and along with it the Supposition that vol- 



Body at a Number of Eastern and Western canoes constitute vents for the escape, aS 



Universities and Colleges: Pbofessob „ j; t. • i i i • i 



RuBOLF ToMBo, JE 166 ^ ^onsequence of shrinkage and subsidence, 



of a portion of the molten content lying 



Scientific Books:— everywhere under the solid crust. The 



Montgomery on the Analysis of Racial i, ,„ j.i, • ^r, i. j.i • j. • j? ji .-, 



Descent il AnunaU: Pkofessoe E. g. hypothesis that the interior of the earth, 



CoNKLiN i 173 while m the main solid, has cavities con- 

 taining melted matter which occasionally 



Scientific Journals and Articles 176 • jj j . • j^i j? n 



is forced out m the form of eruptive out- 



Discussion and Correspondence:— bursts is a kindred one which has found 



Glaoiation in the Sonoran Province: Db. ^^^^ adherents. But a truly solid interior 



W J McGee. The Earthquake and Pro- , , -, ^ -, 



fessor Larkin: B. S. J 177 ^^^™^ *^ ^^ demanded by the accepted 



great rigidity of the body of the earth, and 



T,-™^ T/«^.- *v V! ^j. r •*• 7 TVT 7 ^- ^ Mallet has put forward the idea that extra- 



Ttme Variation of the Initial Nucleation of . 



Wet Dust-free Air: Professor Gael ordinary pressures exerted to crush the 



Baeus. Use of the Term Permian in rocks would result in their becoming 



American Geology: Dr. Charles R. Keyes. 180 heated and melted. Evidently, however, 



Quotations : — mere pressure acting alone, however great, 



Professor M'Kendrick and the Progress of would not suffice for this. Incipient 



^*^^ ^^^ ■ ^^^ fluidity would substantially put an end 



Astronomical Notes:— to the crushing process and heat genera- 



The System of Castor; Reflecting Telescopes ^-^^ ^^^j^ ^^ rj.^^ observed high tem- 



of Short Focus; Some Considerations re- . 



garding the Number of the Stars: Peo- peratures attained by volcanic products 



FEssoB Solon I. Bailet 182 during eruption would not be reached. 



Recent Vertebrate Paleontology: B..F. O.... 184 ^^re recently the thermal effects of vol- 



The Pure Food Bill 185 canoes, and the various results .thereof, 



Scientific Notes and News 139 ^^^^ ^^^ ascribed by one authority to the 



University and Educational News 192 P^^^nce of radium, which, as is known, 



continuously gives out energy in its break- 

 ing up. But volcanic lavas have not been 



MSB. intended for publication and b<«ks, etc., ^^^^^ f^^^d tO be SOUrCCS of radium Or of 



review should be sent to the Editor of Science, GarriBon-on- 



Hudson, N. Y. urauium, the amount of which should be 



