366 



Reports on Special Researches 



readings were in higher and lower latitudes, so that the effect may be regional rather than 

 directly due to the pressure. 



It is of interest to note that the ratio-^is considerably above unity. This condition 



was found to hold pretty consistently, and in regions of steady winds and settled weather 

 the ratio was almost invariably above unity. In view of the fact that no measurable 

 amount of radioactive deposit could be collected on a negatively charged wire while out in 

 the open sea, it seems impossible to explam the value of the ratio, as has been attempted, 

 by ascribing the greater rate of dispersion of a negative charge to the ionizing effect of the 

 deposit collected on the negatively charged inner cylinder.^ 



OBSERVATIONS ON CRUISE I OF THE CARNEGIE. 1909-1910. 



(W. J. Peters in Command.) 



Observations for specific conductivity and radioactive content of the atmosphere were 

 taken on the portions of Cruise I of the Carnegie (see Fig. 15) from Falmouth to Madeira, 

 Madeu-a to Bermuda, and Bermuda to New York. The extracts on pages 367-369 are 

 taken from the report of the observer, Edward Kidson.- 



FiQ. 15. — Cruise I of the Carnegie, 190&-1S10. 



'See Kurz, Dissertation zur Erlangung der Doktorwurde, Giessen. 1907. 



'See Terr. Mag., vol. 1.5, pp. 8.3-91, 1910. 



