passing upward, through the holes in the plate on 

 which the material rests. In starting a run the 

 water was also heated by a Bunsen burner un- 

 til water "began to come through the condenser, 

 after which the steam coil furnished heat enough 

 to keep a small stream of water dripping from 

 the outlet. 



The four joints of the apparatus; (l) "be- 

 tween the top of the still and the head, (2) "be- 

 tween the two parts of the still, (5') "between 

 head and cross piece and (4) "between croespiece 

 and condenser, were all packed with gaskets cut 

 from asbestos reinforced with fine wire mesh 

 ("gas engine packing 11 ), "between brass collars 

 tightened "by "brass screws. The lower side of each 

 ring was coated with white lead and the upper 

 with graphite. This did away with the necessity 

 of cutting fresh rings after each run. 



At the start of each run the still was 

 f illed. with w-.'ter to about one inch in the gauge 

 glass. The water which distilled over was with- 

 drawn from under the oil "by a siphon and returned 

 to the still. The oil floated on the water in 

 the receiving bottle and was withdrawn from time 

 to time with a pipette. In some cases a slight 



