1<>> Aiiud/s l\iito}}iolo{!^ical Socuiy 0} America [\'ol. Ill, 



Fn.. It). Lncxpandcd bulb it 

 .1 ranea circulala. 



I. a. 



i 



I 



cyni. -—•/(" ''.i 





lit. 



p.»i . ,. 



con. 



"'• fmh. 



- m. ii. 



•■rti. 



^' 



Fig. 17. Uncxpandcd bulb tt .inniea 

 circidatii. 



cmb. 



d.h. 



.</. — - 



/>.»/. ii. 



I II. ■ 



III. a. 



I. a. 



I'll.. In. P^xpamlcil bu!li < f \n 

 t irculatti. 



Fii.. lit. Kxpan.!"! '."11, , •• \r.,,< 

 circu'ala. 



