August 10, 1917] 



SCIENCE 



141 



The •writer is calling attention to this 

 former note since it was included in an article 

 upon a broader subject, -which accounts for the 

 oversight of the reviewer. 



Ernest Shaw Eeynolds 



Agricultural College, N. D. 



PROCEEDINGS OF THE NATIONAL 

 ACADEMY OF SCIENCES 



The fifth number of Volume 3 of the Pro- 

 ceedings of the National Academy of Sciences 

 contains the following articles: 



The laws of elestico-viscous jioiv: A. A. 

 Michelson, department of physics, University 

 of Chicago. A number of empirical formulas 

 are given. 



A new equation of continuity: Frederick G. 

 Keyes, Research Laboratory of Physical Chem- 

 istry, Massachusetts Institute of Technology. 

 A comparison of a modification of van der 

 Waals' equation with experimental results ex- 

 tended over wide ranges, showing satisfactory 

 agreement between the equation and experi- 

 ment. 



The classification of vascular plants: Ed- 

 ward W. Berry, Geological Laboratory, Johns 

 Hopkins University. 



Displacement inter ferometry in connection 

 with U -tubes: C. Barus, department of phys- 

 ics. Brown University. 



Attempt to separate the isotopic forms of 

 lead by fractional crystallization : Theodore W. 

 Eichards and Norris F. Hall, Wolcott Gibbs 

 Memorial Laboratory, Harvard University. 

 One may infer that the molal solubilities of the 

 nitrates are probably essentially identical, and 

 that isotopes are really inseparable by any 

 such process as crystallization. 



Hybrids of Zea tunicata and Zea ramosa: 

 G. N". Collins, Bureau of Plant Industry, U. 

 S. Department of Agriculture. 



Distribution of gall midges: E. P. Pelt, New 

 York State Museum, Albany, IvTew York. A 

 discussion of the existing distribution and of 

 hypotheses concerning the way in which it may 

 have been brought about. 



Fertility and age in the domestic fowl: Ray- 

 mond Pearl, Biological Laboratory, Maine 

 Agricultural Experiment Station. There is a 



steady and progressive decline in fertility after 

 the first breeding season. 



A kinetic hypothesis to explain the function 

 of electrons in the chemical combination of 

 atoms : William A. Noyes, department of chem- 

 istry. University of Illinois. 



Transverse displacement interf erometry : 

 Carl Barus, department of physics. Brown Uni- 

 versity. 



The proteins of the peanut, Arachis hypo- 

 gwa: Carl 0. Johns and D. Breese Jones, Pro- 

 tein Investigation Laboratory, Bureau of 

 Chemistry, Department of Agriculture, Wash- 

 ington. Peanut meal contains a high percent- 

 age of lysine and could well be used to supple- 

 ment a diet of corn and wheat. 



A design-sequence from New Mexico : A. V. 

 Kidder, Phillips Academy, Andover, Mass. It 

 has been possible to identify five successive 

 steps in the modification of a design. 



The equilibrium between carbon monoxide, 

 carbon dioxide, sulphur dioxide and free sul- 

 phur: John B. Ferguson, Geophysical Labora- 

 tory, Carnegie Institution of Washington. 



Physiological effect on growth and reproduc- 

 tion of rations balanced from restricted 

 sources: E. B. Hart, E. V. McCollum, H. 

 Steenbock and G. C. Humphrey, departments 

 of agricultural chemistry and animal hus- 

 bandry, University of Wisconsin. Studies 

 pointing to the necessity of the accumulation 

 of further information on the physiological 

 behavior of feeding stuffs. 



What determines the duration of life in 

 metazoa? Jacques Loeb and J. H. Northrop, 

 Laboratories of the Rockefeller Institute for 

 Medical Research, New York. Drosophila has 

 a temperature coefiicient for the duration of 

 life of the order of magnitude of that of th§ 

 chemical reaction. Since we know that the 

 duration of the larval stage is determined by a 

 specific hormone, we must consider the possi- 

 bility that the duration of life is also primarily 

 determined by the formation of a hormone in 

 the body. 



The interrelation between diet and body 

 condition and the energy production duriyig 

 mechanical worh in the dog: R. J. Anderson 

 and Graham Lusk, physiological laboratory. 



