L69 



sulfuric acid was resorted to. Thirty-five grams of crystallized sugar were 

 obtained, which were identified as xylose. 



The multirotation of xylose, as observed by Tollens, was confirmed. The 

 initial rotation, five minutes after solution, was 71.65°, which became con- 

 stant at lS.40 a after ten hours. 



On the determination of chlorine in natural waters. By W. A. Noyes. 

 ( Abstract.] 

 American waters, apparently, contain much smaller amounts of chlorine 

 than most natural waters in England. The methods of direct titration 

 with silver nitrate and potassium chromate as advised by "Wauklyn and 

 Frankland give too high results, and sometimes two or three times as 

 much chlorine as is actually present, in the case of waters low in chlorine. 

 When 250 cc. of the water were concentrated to about 25 cc. and filtered, 

 the titration with T } )5 normal silver nitrate, using potassium chromate as 

 an indicator, gave results agreeing with the gravimetric determination 

 within T V part per million in the case of a water containing but four parts 

 per million of chlorine. 



tniofurfurol and its condensation products. by w. e. stone and 

 Clinton Dickson. 



[Abstract.] 

 Thiofurfurol is made by the action of hydrogen sulphide on an alcoholic 

 solution of furf uramid. It is characterized by its disagreeable odor. It is a 

 white powder, melting at 117° and containing about 29 per cent, of sulphur, 

 corresponding to the formula C 3 H 4 OS. On heating strongly vapors are 

 given off which, on condensation, leave beautiful fibrous crystals, which 

 are not easily acted upon, probably a condensation product. If the thio- 

 furfurol be heated with an excess of fine copper at a temperature below 

 the boiling point of water decomposition takes place. On extracting the 

 mass with ether and evaporating, there remains a tarry mass which yields 

 compact crystals which melt at 149°, contain no sulphur and are probably 

 also a condensation product. The subject will be investigated further. 



Determination of valences. By P. S. Baker. Published in DePauw Bul- 

 letin. 



