Show SCIENTIFIC DROPS A man breathes about eighteen pints of air per minute or upward of seven hogsheads hogs-heads in a day PHOTOGRAPHS ELrcinic LInT Many of the London photographers are introducing electric lights in their studios both for taking the pictures and for printing print-ing the negative the long periods of foggy weather preventing the use of direct light 8000 JULES IN A SECOND Observations mado to determine the longitude of Montreal showed that the limo necessary to transmit an electric current cur-rent across the ocean and back again was a trifle over one second the distance covered being 8000 miles i PROPELLED Br SEA WATER A design of an electric boat propelled by a sea water battery has been exhibited before be-fore the French academy of sciences The battery plates are under the boat in the form of a keel and tho current generated drives a motor operating the screw The copper or zinc plates are raised or lowered by means of pulleys O CUTTING BRASS WITH CHEMICALS A recent method suggested of cutting brass articles by means of chemicals consists con-sists of drawing a line across the metal at the desired point with a quill pen dipped in I I a strong alcoholic solution of corrosive sub iimate After drying the same line is passed over with ttig pen dipped in nitric acid when the metal may oe broken like glass cut with a diamond A SADDLE ON SPRINGS A new saddle recently invented has a series of springs connecting the upper sad dletree or seat with tho lower to relieve the rider from constant jolting The springs are cone shape workIng within each other and are of tempered steel so as to work freely wherever the motion of the horse may bring theweight of the rider |