404 , D. Breed on Bismathyl. 
annexed to the figures themselves which have reference to these 
axes, aud not toa letter P, of no special significance. Of the 
descriptive expressions for figure 2, the first of the two following 
methods— 
Author's, 0, 1, 2, 4, a, Isc, ox, o-2, 08, 2-2, 83, 4-4, $3, 4-2 
Naumann’s OP, 1P,2P 4P, aP, Px, «Px, «P2, xP3, 2P2, 3P3, 4P4, FPS, 4P2 
is certainly as full and explicit as the second or Naumann’s. 
ompare also the descriptions of figure 3. 
heather oe SR 1 ES Se, 1, 14, 288 
Naumann’s, «P, $Poc , Po , 2Px, aPa , P, P2, 2P2 
In the first of these, the short mark (~), as explained, is placed 
where it properly belongs over the figure which directly refers 
to the shorter lateral axis. This modification of Naumann’s 
method is but slight, yet seems to be of some importance. 
Arr. XLIL—Bismathyl, (Bismuth-ethyl,) a new Organic Radi- 
cal contuining Bismuth ; by D. Baeep, M.D., New York. 
_ Bismota is allied in many respects, particularly in its combin- 
ing proportions, to antimony, but it differs from that substance in 
the insolubility of its sulphur compounds in sulphide of ammo- 
nium, and as yet we have not been able to combine it with 
hydrogen. 4 
After the discovery of stibethyl, Professor Léwig songht to 
ascertain whether bismuth may not form compounds with ethyl 
and methyl similar to those of antimony, and in facts as already 
given in the treatise upon stibethyl, bismethyl was produced 
quite agreeing in its external properties with stibathyl. 
During my residence in Zurich in the summer of 1851, under 
the lustraction of Professor Léwig, I submitted bismeethyl toa 
particular investigation; but L regret my stay was not long enough 
to bring the research to.a termination. In the following pages 
I give the results.thus far obtained, and hope in a second article 
to complete the details of the investigation. 
The substances for producing bismeathyl are iodid of ethyl 
and bismuth-petassium. ‘The latter is produced similarly to auiti- 
mouinm-potassiam, but as bismuth fuses easier than antimony, 
we must, 10 the preparation of bismuth-potassium be careful that 
the process progresses as fast as possible. Bismuth-potassium 1S 
best obtained when we bring 16 ounces finely pulverized bismuth 
and 20 ounces crude. tartrate of potassa (also pulverized) into @ 
Hessian crucible, which is then covered and at first slowly heated, 
then the fire is increased to such a degree that the erncible attains 
to white heat in half an hour, at the longest, In thi e& 
