436. Scientific Intelligence. 
fore admit with certainty that the equivalent of sulphur (16) represents 
one volume of vapor, like oxygen 
The vapor of selenium presents the same anomalies as the vapor of sul- 
phur. At 860° its density is 82; at 1040° it is not more than 6°37. 
The authors propose to determine the density of this substance at still 
higher temperatures. _ 
The vapor density of phosphorus at 1040° is 451 vol., correspond- 
ing to the equivalent generally adopted. The vapor density of cadmium 
at 1040° is 3-942 vols. Calculated on this hypothesis it would be 3°87. 
At 1040° the vapor density of sal-ammoniac is 1:01=8 vols. (calcula- 
ted 0°92.) The observed vapor density of bromid of aluminum 1s 
18°62=2 vols. (calculated =18°51). 
The vapor density of iodid of aluminum in like manner corresponds to 
These two last numbers are calculated from experiments made in the 
vapor of sulphur. The iodid of alumi 
lished a fourth memoir in continuation of his investigations of the com- 
pounds of metals with organic radicals. By the action of zine-ethy] 
upon the iodid of stannethyl, the author obtained a crystalline compound 
of iodid of zinc and bi-ethyl-tin, having the formula Sn(CaHs)24-Zal, 
the reaction being represented by the equation 
SnCsHsI + ZnCsHs = (Sn(CsHs)24-Znl). 
' again distilled, bi-ethyl-tin passes over asa cl 
metallic but not disagreeable taste. 
flame givin 
ethyl is not capable of uniting with any other element unless an equiva 
lent of ethyl is separated at the same time. Iodine forms with it a com- 
pound having perhaps the formula Sn2o(CaHs)2I, though it may be the 
compound described by Cahours and Riche, Sn2(CaHs)31. 
By the action of methyl-zine upon iodid of stannethy], Frankland ob- 
tained a colorless liquid having the formula Sn i ee which he terms 
ahs amthyiie of tin, the vapor density of which also corresponds to 
2 v0 
and distils over unchanged. -It burns with a dark deep blue bordered 
g off whi 
2 ‘When zine-ethy] is brought into contact with the iodid of methyl-mer- 
fe ceury, Hg } OT , iodid of zinc is separated after a few hours, and on dis- 4 
tillation, bi-ethyl-mercury is obtained. This body agrees completely with 4 
