214 THE USE OF IODINE IN BLOWPIPING. 
This comprehensive view of the stratigraphy of this” 
county, shows it to be manifestly a continuation of the 
strata of the Taconic and the adjoining series lying to 
the northward in New York and Vermont, and in the 
western portion of Massachusetts. 
Taking these most recent paleontological develop- 
ments with the facts of very much folding and faulting 
of the strata, it is also evident that the complexity of 
the local stratigraphy is very great. No stratigraphic 
chart of Dutchess county will be of much value which 
is not founded on field-work conducted with laborious 
detail. 
JANUARY 12, 1887—FIFTY-FIRST REGULAR MEETING. 
William G. Stevenson, M.D., chairman, presiding ; 
forty members and guests present. 
LeRoy C. Cooley, Ph.D., gave an interesting address 
entitled: ‘‘From Coal Tar to the Alizarine Dyes,” 
in which he illustrated the progress made by chemistry 
in the analysis and synthesis of organic compounds. 
No manuscript of this address has been prepared for 
publication. 
Mr. James Winne was elected an active member. 
FEBRUARY 9, 1887—FIFTY-SECOND REGULAR MEETING. 
William G. Stevenson, M.D., chairman, presiding. 
The following paper was read: 
ON THE USE OF IODINE IN BLOWPIPING. 
BY MR. CHARLES L. BRISTOL. 
In.1866 Bunsen studied iodine films and their appli- 
cation to blowpiping and he is the first to define the re- 
sults thus obtained. His method was to support the 
sample to be tested on asbestos threads and hold it in the 
upper oxidizing flame of the burner that bears his name. 
The volatilized oxides were condensed on the surface of 
°8 
