iced under the head of
burnettizing.

Experiment No. 17 was tried on the Hudson River Railroad. It consisted
of 1,000 sap pine ties, which had been impregnated in the South, by the
Boucherie process, with a mixture of sulphate of iron and sulphate of
copper, under Hamar's patent. These ties were laid in the tunnel at New
Hamburg, a trying exposure, and when examined, in 1882, several of them
were still in the track. The process, however, was found to be so
tedious that it was abandoned after a year's trial, and has not since
been resumed.

In 1882 Mr. H. Fladd, of St. Louis, patented a method which is the
inverse of the Boucherie process (experiment No. 18). To the cap
fastened to the end of a freshly cut log he applies a suction pump, and
placing the other end into a vat, filled with the desired solution, he
sucks up the preserving fluid through the pores or sap cells of the
wood.

Quite a number of experimental ties have been prepared in this way, with
various chemical solutions, chief of which was sulphate of copper, and
there is probably no question but that the life of the wood will be
materially increased thereby.

Whether the process will prove more convenient and economical than the
original Boucherie process can only be determined by practical
application upon an extensive scale.

A considerable number of modifications and appliances for working the
Boucherie process have been patented in this country; but none of them
seems to have come into practical use, probably because of the necessity
for operating upon freshly cut logs, and the inconvenience of such
applications.

The table on this page gives a record of various experiments with
miscellaneous substances.

RECORD OF AMERICAN EXPERIMENTS--MISCELLANEOUS.

--+------------+----+-----------+---------+----------+---------+---------------
| | | |Material |Subsequent| |
No| Locality |Year| Process. | Treated.| Exposure | Results.| Authority.
--+------------+----+-----------+---------+----------+---------+---------------
1|Chestnut |1839|Earle's |Hemlock |Paving |Failure |S.V. Beuet
| Street, | | | blocks | | |
| Philadelpha| | | | | |
| | | | | | |
2|Watervliet |1840| " |Oak |Gun | " | "
| Arsenal | | | timber | carriage |