Somzee's New Gas Burners.--Interesting description of
regenerative burners.--9 figures. 8958

The Clamond Gas Burner.--Of value as a supplement to the
above named article, describing an incandescent burner.
--1 illustration. 8959

Wood Oil.--A new industry worked on the large scale in
Sweden. 8962


* Transcriber's Note: "Work on Plantations..." was
originally part of TOC entry "Optical Errors..."


* * * * *




COMPOUND HYDRAULIC PRESSES.


In a hydraulic packing press, the work done by the ram during one
stroke may be roughly divided into two periods, in the first of which
the resistance, although gradually increasing, may be called light,
while in the second the resistance is heavy. The former of these two
periods embraces the greater part of the stroke, and it is only a
small proportion at the end which requires the exercise of the full