avement |Favorable,|Schlitz Bg.
| | | | | | 1882 | Co.
8|Norfolk, Va. |1876| " |Hackmatack|Teredo |Failure |P.C. Asserson
| | | | | | |
9|Charlestown, |1877| " |Various |Laboratory|Favorable |J.F. Babcock
| Mass | | | | | |
10|Wabash R.R. |1877| " |Ties |R.R. track|Unfavor. |R.A. Houghton
| | | | | | |
11|Wabash R.R. |1878| " | " | " " | " |W.S. Lincoln
| | | | | | |
12|New York, |1879| " | " | " " | " |C. Latimer
| Pennsylvania,| | | | | |
| and Ohio R.R.| | | | | |
13|Lake Shore and|1879| " | " | " " | " |R.A. Houghton
| Michigan | | | | | |
| Southern R.R.| | | | | |
14|Cleveland and |1879| " | " | " " | " |C. Latimer
|Pittsburg R.R.| | | | | |
15|Charlestown, |1879| " |Spruce |Sidewalk |Success |S.G. White
| Mass | | | plank | | to 1882 |
16|Baltimore and |1879| " |Ties |R.R. track|Too recent|J.L. Randolph
| Ohio | | | | | |
17|Hudson River |1869|Hamar | " | " " |Success |E.W. Vanderbilt
| R.R. | | | | | |
18|St. Louis |1882|Fladd | " | " " |Too recent|H. Fladd
--+--------------+----+--------+----------+----------+----------+---------------

COMMENTS ON SULPHATE OF COPPER EXPERIMENTS.

The first experiment was carried out by Mr. W.W. Evans, on the Southern
Railway of Chili, in 1857, and he informs your committee that in 1860,
when he left that country, the ties were still good and in serviceable
condition.

We give herewith, in Appendix No. 16, an interesting letter from Mr. E.
Pontzen to Mr. Evans, on the subject of the Boucherie process.

Experiments Nos. 2 to 16, inclusive, were all tried with various
modifications of the sulphate of copper process as introduced by Mr. W.
Thilmany in this country. They date back to 1870 (experiment No. 2),
when Mr. Thi