1903, p. 254), who says: "Tobacco smoke, 

 contrary to popular belief, does not contain 

 nicotine, which is decomposed by the heat; 

 but pyridine and its homologues and the bene- 

 ficial effects of tobacco in many cases of asthma 

 must be attributed to this latter." 



The Lancet investigation (see Lancet, Ap. 6, 

 1912, pp. 944-947) was mode because "a recent 

 review of numerous analysis of tobacco which 

 have been published from time to time raises 

 some doubt as to whether the results given cor- 

 rectly represent the actual alkaloidal contents 

 of the tobacco." Moreover, to find the relation- 

 ship of the true amount of nicotine in any 

 tobacco to that in the smoke produced by the 

 combustion of that tobacco, and any modifica- 

 tion caused by the method of smoking. 



The investigation was conducted under the 

 strictest conditions, the most recent methods of 

 chemical research being employed. 



The following table (given by the Lancet) 

 shows the nicotine contents of various tobacco 

 samples and the percentage of nicotine in the 

 smoke : 



J85 



