SCIENCE 



Friday, June 27, 1919 



CONTENTS 

 The Pacific Division of the American Associa- 

 tion for the Advancement of Science: — 

 Growth in Organisms: Dr. D. T. MacDougal. 590 



Joseph BarreU: Professor Chas, Schuchert. 605 



Scientific Events: — 



The Sol<ir Eclipse; Eevista Matematica 

 Bispano-Amcric<ina; Expeditions of the 

 California' Academy of Sciences; Foreign 

 Delegates and Guests of the American Med- 

 ical Association ; Bonorary Degrees at Yale 

 University 607 



Scientific Notes and News filO 



University and Educational News Gil 



Discussion and Correspondence: — 



Tectonic Form of ths Continents: Dr. 

 Charles Ketes. American Assistance for 

 Sussian Educational Institutions : Professor 

 N. BORODIK 612 



Scientific Books: — 



Young's Lessons and Elements of Astron- 

 omy: Professor Charles Lane Poor 61-1 



Special Articles: — 



Further Studies in Colloid Chemistry and 

 Soap: Professor Martin H. Fischer 615 



The Buffalo Meeting of the American Chem- 

 ical Society: Dr. Charles L. Parsons .... 618 



MSS. mtended for 'publicatioD and books, etc., intended for 

 reriew should be sent to The Editor of Science, Gorrison-on- 

 Hudson, N. Y. 



GROWTH IN ORGANISMS! 



The main proposals discussed in this ad- 

 dress were as follows: 



1. The development of an organism from 

 the spore or embryonic stage includes the two 

 processes of ausesis or enlargement and of 

 differentiation both in the single cells or ele- 

 ments and in the organs. 



2. The present studies are based upon the 

 conception that living matter is composed 

 mainly of x)entosans and albumins or albumin 

 derivatives with lipins as a minor component. 

 The proportion of the main components may 

 vary from nearly a hundred per cent, to 

 nearly zero. 



3. The principal and characteristic sub- 

 stances of the two groups are practically non- 

 diffusible and hence come together only as an 

 intimate mixture in a colloidal condition, with 

 varying arrangement. 



4. Gro^'th of living matter consists of hy- 

 dration with accompanying swelling and of 

 accretion of solid matter, the two processes 

 being actually independent. 



5. The hj'dration of the substances belong- 

 ing to the two main components is affected 

 in an opposite manner by hydrogen ions, and 

 is variously modified by temperature and other 

 conditions : the rate and amount of growth is 

 a resultant of several reactions. 



6. Accretions of new material include the 

 absorption of salts which tend to restrict hy- 

 dration and the incorporation of amino-com- 

 poimds. So-called nutrient salts do not con- 

 stitute food but may act as catalysts or re- 

 leasers of energy in other substances and as 

 controls. 



7. The enlargement of cells is almost en- 

 tirely by the swelling which results from hy- 



1 Presidential address, Pacific Division of the 

 American Association for the Advancement of Sci- 

 ence meeting at Pasadena, June 19, 1919. Manu- 

 script abbreviated by the anther. 



