INTRODUCTION. 35 



to results in which so many approximations have to be made. 

 In the second part of the paper, an investigation into the in- 

 heritance of the length of the corolla in three varieties of N. 

 acuminata is described and the author states that, although this 

 character shows very small fluctuations in the parents, the 

 variation in the Fj is very great and covers the whole difference 

 between the two parents. The details of the Fo generation 

 have not yet been published. 



The only other investigations on hybridization in the genus 

 Nicotiana, which are known to me, are those by Jensen^ and 

 Lodewijks.- Hybridization experiments were started by Jensen 

 in 1906 and the crosses investigated in most detail were those 

 between Peru, a variety with a petiolate leaf, and White 

 Burley, Peru and Maryland smoking. The intermediate nature 

 of the Fi and the great complexity of the F, generation, with a 

 total absence of the parent forms was emphasized. The most 

 interesting point is the appearance of new characters in the 

 offspring which were not present in either parent. 



^ Jensen, Jaarhoek fan ket Department van Landbouw in Neederlandsh-Indie, 1907 

 1908, 1909, 1910, 1911. 



* Lodewijks, Zcitschrifi fur induktive Abstammungs und Vererbungslehre, Bd. V, 1911. 



