s, pots oUû/r?e£/ ^/ï/7 



Hà/hout i/apoc/r j'n tut>es 



With yapour in tatpes 



Spots oiptû/ned i4//ïh 

 X^ 4358-66 /fu. 



(Q 



l4^f/7 i^apour /n ti/t^^s 

 (d) 



Note — in each /t/ostraT/û/? thie Jeff /land spot pvas 

 produced by light issa/hç from the <iuartj^ fi/be . 

 - tti^ r/çhf hûnà spof h y ttçhf /ssu/nç from îhe 

 glass tui?e. 



Pfate I . 



