58 
lection of the revenue. It is much more simple, more port- 
able, and less liable to breakage than the Tralles instrument. 
It was approved by the Academy on the discussion of the 
report, and will therefore be presented to the Treasury De- 
partment for adoption. It is so small, that the bulb and 
chain, which form the measuring part of the apparatus, is 
contained in a box of three quarters of an inch in diameter 
and one inch high. 
The following resolution, in regard to Mr. Saxton’s hy- 
drometer, was adopted by the Academy on the 7th of 
January : — 
“ Resolved, That the words following be added to the close 
of the report, viz.: ‘It being understood that Mr. Saxton 
places this invention at the disposal of the government 
without any view to remuneration.’ ” 
A letter from Mr. Saxton, marked H, is appended to this 
report. 
The next subject, Committee No. 5, was brought before 
the Academy in the following letter of the Chief of the 
Bureau of Navigation of the Navy Department : — 
Bureau of Navigation, Navy Department, 
Washington, May 23, 1863. 
Sir : —I transmit herewith a copy of a letter addressed 
by me to the Honorable Secretary of the Navy, on the sub- 
ject of discontinuing the publication, in the present form, of 
the “ Wind and Current Charts,” and “ Sailing Directions ” 
accompanying them ; and now, with the approval of the De- 
partment, I have the honor to refer the same subject to the 
National Academy of Sciences, for investigation and report, 
