INFORMATION TO SUBSCRIBERS 
i![STJBSCRiPTiONS at the rate of $5.00 per annum should be made payable 
to the National Acadenjy of Sciences, and sent to Williams & Wilkins Com- 
pany, Baltimore, or Arthur L. Day, Home Secretary, National Academy of 
Sciences, Smithsonian Institution, Washington, D. C. Single numbers, $0.50. 
