588 Serentific Intellugence. 
the phosphorus in the upper portion, in which the arsenic phos- 
phide ae collected, becomes black on sudden cooling, while that 
in the lower portion undergoes no such change. e author con- 
cludes therelure that black phosphorus is not an allotropic form 
of this substance, but that the result is due to a sort of liquation 
heey d by the presence of an impurity. In the case of commer- 
cial phosphorus, this is generally arsenic; but other substances 
will effect the result, as is shown by Blondlot’s black phosphorus 
produced by mercury. Ritter has oo it with copper also.— 
= Soe. Ch., Il, xxi, 151, Feb. nee 
3. Influence of the ‘position of ae Oxygen atoms in the Mole- 
cule upon the boiling point.—From an extended comparison of 
americ. = bodies containing oxygen, Naumann derives 
owi 
oxygen soos n the boiling point: In metameric bodies of the same 
chemical character and of otherwise similar structure, the more 
the oxygen—similarly combined in the molecule—approaches en 
middle of the atomic chain, the lower is the boiling point. 
numerous examples given, one from each class must suffice for 
illustration : 
; Normal Alcohols, pointe 
Normal primary butyl alcohol, CH,.CH,.CH,.CH, : 
: 116° 
ia ‘ “ec OH 
* ‘Secondary ‘ CH,.CH,.CH.CH, vas 
4 9 
OH 
Isoalcohols, 
; H,C 
Fermentation amyl alcohol, 3 | CH.CH .CH. 
y H,C 2 : 2 128°—132° 
Meth oe CH 
ethylpseudopropylearbinol t CH.CH.CH 
vp propy ? uy °0 $ 104°-108° 
OH 
‘ 25 H,C 
Dimethylethylearbinol, 8 Lc C.CH,.CH 
yseuny H,c 2 3 98°5°-102° 
OH 
Mixed Normal Ethers. 
Methyl-propyl ether, CH,.CH,.CH,.0.CH, 49°52" 
Diethyl ether, CH,.CH,.0.CH,.CH, 35°5 
. Mixed Iso-ethers. 
Methylisoamyl ether,” He 06 | CH.CH,.CH,.0.CH, 92° 
Ethylisobutyl ether, H, °¢ | CH.CH,.0.CH,CH, 78°80" 
