— I50 — 



ant chemist of the Station, Mr. W. P. Cutter, furnish this demon- 

 stration, proving- that the substance in the glass tube is heated to 

 the temperature of the boiling water in the bath, although the 

 tube itself is not in contact with the water, just as fully as when 

 the vessel containing the substance is in direct contact with the 

 water. The same thermometer was used in all the experiments. 



1. Temperature of water boiling in covered beaker, ......... ioo° 



2. Teniperature of water boiling in the drying apparatus, ioo° 



3. Teniperature of substance [bran] in a test tube immersed' in boiling 



water, the bulb of the thermometer imbedded in the substance, . 101° 



4. Temperature of the substance in the drying tube in the apparatus, 



taken in the same manner as in 3, 101° 



5. Temperature of the substance in the drying tube in the apparatus, 



with hydrogen circulating through instead of air, 100° 



The observation made in test three, and confirmed in the next 

 succeeding test, in both of which cases the air was not displaced 

 by hydrogen, is interesting as indicating oxidation of the sub- 

 stance when heated under such conditions, and thus still further 

 enforcing the necessity of using hydrogen. 



Aftef- these tests had been made, two samples of the bran sent 

 out in 1887-8 were carried through the drying operation and the 

 extraction by ether. A perfectly clear extract was obtained,, yield- 

 ing 4.61 and 4.63 per cent, of residue dried in hydrogen. The 

 transfer to the flask for the treatment for fibre was then made 

 without any difficulty. 



The cost of the apparatus, for six tubes, was as follows : 



The copper bath, l3-30 



Each glass tube, with the four stoppers, . i.oo 



Each extractor (fig, 4), i.oo 



Each platinum disk, 70 



The tubes and extractors were made by E. Greiner, 76 Nassau 

 St., New York, who has the full directions for them ; the tubes 

 were furnished under the name of ' 'double-stoppered drying tubes. ' ' 



Prof. G. C. CALDWEI.I.. 



