no. 25. - KM. NF.niTA, March 23, 1914 



TU> viral iKtmU u Mta full on. Notice the central nucleus and the two spiral arms emerging from its opposite directions. Is 

 r flowing oat of the nuilcui into the arm* or along the arms into the nucleus? In either case we should get two streams in 

 diracttobs within th nuclcm. 



