134 Scientific News. (February, — | 
ness of the cloth shall extend between the slides from each end 
one inch towards the centre. It is better, however, to have the 
boxes made for this use somewhat larger than the customary. 
size, so that very thick beaver cloth can be used for the packing. 
For six slides a box may be made of hard wood 3-16ths of an 
inch thick, 334 inches long, 114 wide and 11% deep inside meas- 
urement. The folds of cloth should be so arranged that not 
more than an inch in the centre of the slide is unsupported, 
except when large cover-glasses are to be used, when more space 
should be left to avoid pressing on the cover. The outside ofthe 
box is covered with strong thin cloth. 
The comparative safety of this method is indicated by the expe- 
rience of the Postal Club. During a trial of several months in 
many of the circuits, not one slide is known to have been broken 
while packed in this manner, while to slides in the ordinary boxes 
with wooden racks accidents are unfortunately frequent. For 
sending by express these boxes should be made of thicker wood, _ 
or enclosed in larger cases, to prevent crushing by the weight of 
‘heavy packages among which they may be carried. 
—:0:—— 
SCIENTIFIC NEWS. 
— At the late meeting of the American Association for the — 
Advancement of Science at Nashville, Tenn., Dr. T. Sterry Hunt — 
presented a report on the subject of an International Geological À 
Congress, from which we extract the following: 
“The Committee to arrange for an International Geological 
s . . . 8 as ; p 
Exhibition and Congress, to be held in Paris in 1878, W 
appointed by this Association at. Buffalo, in August, 1876, and i 
- 
consisted of Messrs. W. B. Rogers, James Hall, J. W. oe 
o 
- the general Exhibition to be held at Paris in 1878, and indicating _ 
to be — 
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