Fridat, January 6, 1922 



The American Association for the Ad- 

 vancement of Science: 



The Significance of Calcium for Higher 



Green Plants: Dr. Rodney H. True 1 

 The Method of Science in Agriculture: 

 Dr. E. W. Allen 6 



The Concilium Bibliographicum: Dr. 

 Vernon Kellogg 11 



Henry Turner Eddy: J. J. F 12 



Scientific Events : 



The Sterling Hall of Medicine of Tale 

 University ; The Crop Protection Insti- 

 tute; Public-Health Work in the Philip- 

 pines 13 



Scientific Notes and News 15 



University and Educational Notes 18 



Discussion and Correspondence : 



Public Health and Medical Practice: 

 De. W. Gilman Thompson. Note on 

 Inheritance in Swine: A. M. Caer- 

 Saunders. On Summaries of Recent 

 Advances in Physics: Professor Carl 

 Baeus 18 



Scientific Books: 



Beam on The Trees of Indiana: Pro- 

 fessor George E. Nichols 20 



Notes on Meteorology and Climatology : 

 Sky Brightness and Daylight Illumina- 

 tion: De. C. Le Roy Meisingee 20 



Special Articles: 



On Stereotropism as a Cause of Cell 

 Degeneration and Death and on Means 

 to Prolong the Life of the Cell: Dk. 

 Leo Loeb 22 



The American Chemical Society: Dr. 

 Charles L. Parsons 23 



ended for public 



tended for 

 on on-Hud- 



THE SIGNIFICANCE OF CALCIUM 

 FOR HIGHER GREEN PLANTS^ 



In view of the time limit reasonably set for 

 this paper, I shall not attempt to review the 

 very extensive literature that in one way or 

 another deals with the relation of calcium to 

 the plant world, but shall content myself with 

 pointing out certain of the land marks that 

 occur at certain intervals along this oft-traveled 

 road. And, at the beginning, I may as well 

 give Jost's simiming up of the situation as he 

 saw it in 1906, -when he says, "We are bound 

 to admit that its function has not yet been 

 discovered." 



To Salm-Horstmar^ seems to belong the 

 credit of proving in 1856 that calcium is neces- 

 sary for phanerogams and is distinctly not 

 replaceable by magnesium. 



Almost simultaneously in 1869 Adolph 

 Mayer * and Raulin ^ showed that this rule was 

 not of general application since certain non- 

 chlorophyllose types were found to thrive 

 without it. 



Mayer grew yeast normally in media from 

 which calcium was lacking and Raulin did the 

 same with Aspergillus. It remained for 

 Moliseh^ in 1895 to demonstrate that not all 

 green plants require ealcimn by cultivating 



'Address of the Vice-President and Cliairman 

 of Section G, Botanical Sciences, American Asso- 

 ciation for the Advancement of Science, Toronto, 

 December, 1921. 



-Jost, Ludwig, "Lectures on Plant Physiology," 

 Gibson's transl. Oxford, 1907: 85. 



sSalm-Horstmar, ' ' Versuche und Eesultate 

 fiber die Nahrung der Pflanzeu, Braunschweig. ' ' 

 1856. 



■*Mayer, Adolph, ' ' Untersuchungen iiber Alko- 

 holgahrung." 1869: 44. 



sRaulin, A7in. d. Sci. Nat.. V, Ser. I, 11: 224, 

 1869. 



isMoUseh, Stizb. d. Wieii. Akad., Abt. I, 104: 

 733. 1895. 



