244 THE FLOW OF SOLIDS. 
Ammonium chloride.—Still more compact, resembles vegetable ivory; possibly the 
beginning of fusion. Observe the order of increasing effect: 
KC1<NaCl<NH,Cl. 
Sulphur roll.—Ground and put through a48-sieve; formed a hard, solid, brittle mass, 
but the original grains were easily distinguishable, there being no trace of a true 
liquefaction. 
SEVENTH TEST. 
Powdered glass.—No effect; scarcely coherent. 
Powdered rosin.—Very good fusion. 
Powdered borax.—A compact, chalk-likemass, slightly translucent ; no crystallization. 
Powdered zine and sulphur.—No trace of fusion or chemical union apparent. Car- 
bon disulphide dissolved out the sulphur so completely that the remaining zinc 
gaye a mere trace of sulphureted hydrogen on treating with hydrochloric acid. 
The zine was slightly coherent, but there was no fusion and no zine sulphide 
formed. 
After obtaining the above results it seemed useless to continue this 
line of experiments, and preparations were made to use more rigid steel, 
by which it was hoped that pressures of at least 10,000 atmospheres 
might be obtained; also for making the compressions in vacuo. Unfor- 
tunately thus far nothing but preparations have been made, since the 
testing machine is kept fully occupied with the special work of the 
department to which it belongs. It is hoped, however, that this inves- 
tigation will soon be taken up again and carried to a close; till then 
our conclusions are only temporary. 
The above substances were also.compressed by W. Spring* in vacuo 
with the following results: 
Lead.—Perfect fusion at a pressure of 2,000 atmospheres. At a pressure of 5,000 
atmospheres it ran out of all the cracks (fentes) of the apparatus. 
Bismuth.—At a pressure of 6,000 atmospheres, perfect fusion. 
Tin.—At a pressure of 3,000 atmospheres, fusion. 
Zine.—At a pressure of 5,000 atmospheres, perfect fusion. 
Antimony.—At a pressure of 5,000 atmospheres, beginning of fusion. + 
Sulphur, prismatic.—At a pressure of 5,000 atmospheres, fusion to the octahedral 
form. 
Sulphur, plastie.—At a pressure of 6,000 atmospheres, fusion to the octahedral form. 
Sulphur, octahedral.—At a pressure of 3,000 atmospheres, fusion to the octahedral 
form. 
Potassium chloride.—At a pressure of 5,000 atmospheres, perfect fusion. 
Sodium chloride.—At a pressure of 5,000 atmospheres, perfect fusion. 
Ammonium chloride.—At a pressure of 4,000 atmospheres, perfect fusion. 
Sodium sulphate (10H,0).—At a pressure of 3,000 atmospheres, perfect fusion. 
Zine sulphate (7H,O).—At a pressure of 5,000 atmospheres, perfect fusion. 
Copper sulphate (5H.O).—At a pressure of 6,000 atmospheres, completely crystal- 
lized. 
Sodium carbonate, dry.—At a pressure of 5,500 atmospheres, stuck together (agglo- 
meré.) 
Iceland spar.—At a pressure of 6,000 atmospheres, imperfect fusion. 
Borax (erystallized).—At a pressure of 7,000 atmospheres, imperfect fusion. 
Glass (powdered. )—At a pressure of 6,000 atmospheres, no effect. 
And so on to the end. 
* Bull. de V Acad. Roy. de Belg., 1880, 2d ser., XLIX. p. 326. 
