166 



SCIENCE 



[N. S. Vol. XLI. No. 1048 



The Harvard University corporation has 

 set aside $100,000 to pay Belgian professors 

 who tave been driven from their land by the 

 war and may give courses at Harvard Uni- 

 versity next year. 



James E. Magee, '59, has left $20,000 and a 

 certain further residuary portion of his estate 

 to Haverford College, to be added to the gen- 

 eral endowment fund. 



The Evans Museum and Dental Institute 

 Building, which will be occupied by the School 

 of Dentistry of the University of Pennsylvania, 

 will be formally dedicated on February 22. 



The Harvard Medical School wiU hereafter 

 admit as regular students men who have com- 

 pleted two years' work in a college or scientific 

 school of high rank, provided they present 

 certificates (a) that they have stood in the 

 upper third of their class, (i) that one year's 

 course has been taken in physics, biology, gen- 

 eral chemistry and organic chemistry, and (c) 

 that they have a reading knowledge of German 

 or French. 



DISCUSSION AND COBBESPONDENCE 

 PROFESSOR Daly's igneous rocks and 



THEIR ORIGIN 



To THE Editor op Science: Permit me to 

 say a few words in regard to the criticism'- by 

 Mr. J. P. Iddings of a book recently published 

 by Mr. E. A. Daly and entitled " Igneous 

 Eocks and Their Origin." The criticism is 

 of the destructive, not to say the volcanic, 

 type, and one may well imagine Mr. Iddings 

 laying down his pen with the deeply felt con- 

 viction that a heretical and dangerous book 

 has finally been disposed of. 



I am afraid Mr. Iddings underestimates the 

 strength of his opponent and he probably does 

 not realize what strong influence the Daly 

 theories, particularly the stoping theory, have 

 on the younger generation of geologists. Mr. 

 Iddings thinlcs that the author of this book 

 suffers from an exuberant, if not a disordered, 

 imagination. What Mr. Daly thinks about 

 the imaginative qualities of his critic has not, 



1 Science, November 13, 1914. 



so far, been made public. An impartial ob- 

 server would probably say that the ideal petrol- 

 ogist would be produced could a " syntectic " 

 assimilation be effected of the two. 



It seems to me that Daly's book is one of the 

 best ever written on the subject of igneous 

 phenomena. The principal facts are assem- 

 bled in the first part of the book, illustrated 

 in abundance from the best sources and from 

 occurrences all over the world. In the second 

 part the theories and hypotheses are set forth, 

 and illustrated in the same lavish manner from 

 the whole world's literature. It is not neces- 

 sary to agree with all of the author's views; I 

 certainly disagree most heartily with some of 

 them. The book is not a " college petrog- 

 raphy " to be put into the hands of the 

 beginner, but the advanced student can not 

 fail to be stimulated by these suggestive and 

 brilliant discussions. Just to point out one 

 line of argument: The theory of gas action, 

 cupolas and " blow-piping " is a most inter- 

 esting and important subject, very largely 

 neglected in most discourses on intrusions. 



As far as his criticism of the " quantitative 

 classification " is concerned, Mr. Daly does 

 not stand quite alone. There are many of us 

 who fail to see in this elaborate system any- 

 thing but an admirable card classification of 

 analyses. 



I venture to suggest, in conclusion, that the 

 unfavorable criticism in Science does not 

 represent the impartial opinion of petrologists 

 in general. 



Waldemae Lindgeen 



Boston, Mass. 



SCIENTIFIC BOOKS 



Photo-chemistry. By S. E. Sheppaed, School 



of Agriculture, University of Cambridge. 



Longmans, Green and Company. 1914. 



Pp. ix + 461. 



In this new volume of the series of " Text- 

 books of Physical Chemistry," edited by Sir 

 WilLiam Eamsay, Dr. Sheppard, of Cambridge, 

 presents us with a most painstaking piece of 

 work, and one which for its size is unusually 

 comprehensive. The author presents his sub- 



