248 - M. C. Lea on the Platinum Metals. 
in the form of the ground. I cannot believe it is owing to optical delu- 
sion, for I think I can see distant objects as well as I ever could. 
[Signed, ] Jacos HaLLEnBEcK.” 
“ Letter from Stillman Turner, Esq., of ooee % a son of Lebbeus 
Turner, dated Worcester, April 2, 
Your pte Ba is at hand, in which you wis aT me to state, ac- 
cording to my best ressllslion, whether Mount Anthony could be see 
from my father’s old residence in Hoosick, and also about the white ae 
on it. The most that I can say at this time is, that Mount Anthony was 
to me no rare sight to yey for I think it was visible from almost any 
point in the vicinity of our old place. I certainly recollect seeing it 
D Ww 
certainly in that neighborhood I could see the white spot spoken of; but 
I do not feel justified in oT whether the mountain could be se n from 
Signed 
our old residence or no [Signed,] Srittman TURNER.” 
Note th Phere K. Scott.—From the hill of which Mr. Turner speaks, no 
part of is now visible. Nor can it be seen anywhere in that imme- 
diate Seighhathood 
Art. XXIX.— Notes on the Platinum Metals ; by M. CAREY LEA. 
Part. Il. On Reactions of the Platinum Metals. 
(IIL) 
REACTIONS OF HYPOSULPHITE OF SODA. 
In the first part of this paper I described the rao of ses- 
quichlorid of ruthenium — hyposulphite of soda, a substance 
which will probably be found to be the best touchstone w phan 
nium is modified when one or more other metals are present in 
the same solution. The remarkable posseitarr which the plati- 
num metals of exhibiting in many cases reactions, when 
mixed, wholly different from those which they show separately; 
renders this a point of much importance. 
by Lr pone pints is to have a little ammonia added before 
eady mentioned. The ammonia must be in sufficient 
quan to ensure that the solution after the addition vot the so- 
on of the cori metal shall be alkaline. 
um o.3 
phite of soda axed — ammonia and boiled, a rich sherry- 
a | “tee polaned.nolation. rah ammonia and boiled a the reaction 
: 
4 
