Hare’s Blowpipe. 297 
holes being removed the mass possesses a uniform density 
will be found to have a specific gravity equal to 20,857. 
During the fusion of the metal its combustion will be often 
ifnot alway apparent. It will burn with scintillation and 
particles of the black protoxide of platinun, if care be used, 
may be caught upon a sheet of white paper while the com- 
bustion is going on.” 
He would here evidently wish the reader to adapt the 
false impression that the facility with which platinum may 
he fused is owing to “ the great improvements” made four- 
‘een or fifteen years after I had devised and used them. 
Will Britons tolerate such conduct in their professors ? 
Silliman, last page. The experiments which have now 
heen related in connexion with the original ones of Mr. 
tare sufficiently show that science is not a little indebted to 
that gentleman for his ingenious and beautiful invention. It 
Was certainly a happy thought and the result of very philo- 
sophical views of combustion, to suppose that a highly com- 
bustible gaseous body by intimate mixture with oxygen gas 
ust when kindled produce intense heat, and it is no doubt 
to this capability of perfectly intimate mixture between 
these two bodies and to their great capacity for heat, that 
the effects of the compound blowpipe are in a great measure 
to be ascribed. 
Clark, Journal Royal Institution, page 122. ‘I consid- 
er this improvement of the blowpipe, one of the most valu- 
able discoveries for the sciences of chemistry and mineralo- 
sy that have yet been made “and thus does he modestly 
awarded according to the motto of “ suum cuique” adopted 
by Dr. Clark, there would be little left for himself and his 
eoadjutors. 
_ Tsubjoin a few drawings of the compound blowpipe in 
its different forms, and of some varieties of apparatus which 
may be used for supplying it with hydrogen and oxygen 
Bas. 
