118 Scientific Intelligence. 
ethylstannethyl appears also to be a colorless oily liquid; the 
acids finely crystallized salts. The author describes the nitrate, sul- 
phate, iodate and bromate, as well as the iodid, bromid and chlorid. 
The three last are colorless oily liquids, which have a penetrating smell 
of oil of mustard and irritate the nose an eyes. 
Ethylstannethy! appears also to be a colorless oily liquid; its com- 
pounds closely resemble those of methylstannethyl. The haloid salts 
of these radicals are immediately reduced by potassium and sodium, 
the radical being set free. 
The author closes his memoir with a discussion of the theoretical 
signification of the results which he has obtained. He considers the 
constitution of the compounds of tin and ethyl as demonstrating that, 
in organic substances, tin may replace carbon, equivalent for equivalent, 
o 
replaced by lead. The following formulas show at once the advanta- 
ges, and even necessity, of this view. 
Methylen, CeHe Methylen stannethyl, Sn2Ae2 
layl, CsHa Elay! stannethyl, Sn4aAe4 
Acetyl, Cais Acetyl stannethyl, SnaAes 
Methyl, CoH: Methy! stannethyl, Sn2Aes 
Ethyl, C4aHs Ethyl! stannethyl, SnaAes 
As these are the first instances on record of a replacement of car- 
carbon by another element their importance is very great. The author 
states further that he has reason to assert the existence of radicals 
composed of tin and hydrogen analogous to the hydrocarbons, and 
points also to the probability that compounds of carbon with ethyl and 
methyl exist, similar to those of tin with the same radicals.—Journal 
ie, lvii, 385 
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