Varietäten, Descendenz, Hybriden. 293 



oü sont combattues les idees systematiques et phylogenetiques que 

 M. Comes avait emises dans ses travaux precedents au sujet des 

 Varietes du Nicotiana Tahaciim. Dans ce travail M. Comes cri- 

 tique severement le susdit memoire de M. Anastasia en citant ä 

 l'appui de son opinion les resultats du travail de M. Splendore sur 

 les graines du N. Tabacwn et de nombreuses preuves nouvelles. II 

 envisage donc d'une maniere critique les varietes du N. Tabacum 

 en montrant que les quatre tj^pes (var. fniticosa, macrophylla , lan- 

 cifolia et vivginica) etablis par lui doivent etre maintenus contraire- 

 ment aux resultats du memoire de M. Anastasia oü ces quatre 

 types sont fondus en deux types, c'est-ä-dire, \e fruticosa 2i\ec macro- 

 phylla d'un cöte, et laiicifolia avec vivginica de l'autre. 



Le second travail est un catalogue des varietes et des tres 

 nombreux hybrides (races) des tabacs suivis des noms sous lesquels 

 ils sont connus dans les differents pays oü ils sont cultives. 



R. Pampanini. 



MacDougal, D. T., A. M. Vail and G. H. ShuU. Mutations, 

 Variations and Relationships of the Oenotheras. (Pub. Car- 

 negie Inst. Wash. 81; Pap. Sta. Exp. Ev. 9. Washington. 1907.) 



In this paper the authors continue their previous researches on 

 the Oenotheras by the consideration of the following problems : 



1) Distribution and Relationship of O. lamarckiana. 



A description published by Miller in 1760, some years before 

 the cultivation of O. lamarckiana in the garden at Paris, is thought 

 to refer to 0. lamarckiana. 



O. lamarckiana was discovered growing near Nantucket City. 

 All that could be ascertained was that the culture was started there 

 many years ago from seed. 



O. laniarckiana is now growing wild in England, and an 

 examination of the litterature renders it probable that is has grown 

 there in considerable profusion for a long time. Pedigree cultures 

 were started from British seed. 



2) Pedigree Cultures of O. lamarckiana and its Mutants. 

 Pedigree cultures have been carried on for the purpose of 



determining the coefficient of mutability of 0. lamarckiana during 

 a series of years and under a variety of conditions. To facilitate 

 9omparison the author's numbers are retained for the cultures. The 

 conditions and results obtained were as follows: 



Culture A. 1. 0. Seed collected by de Vries from purely self- 

 fertilized individuals of O. lamarckiana in Amsterdam in 1901 and 

 sown in the New York Botanical Garden in 1904. The exact number 

 of individuals is not available but there were from 500 to 600 seed- 

 lings among which 26 mutants were identifiable. These were: 

 0. oblonga 12, O. lata 1, O. nanella 1, O. albida 2, O. gigas 2. 



Four other forms which could not be finally identified were 

 represented by 1, 1, 2 and 5 individuals respectively. 



Culture C. 1. 2. Purely fertilized seed from one individual of 

 O. lamarckiana grown in the New York Botanical Garden in 1903 

 was sown in the greenhouse in August 1904. Probably the total 

 number of seedlings was not much over 500. Among these were 33 

 mutants as follows: O. scintillans 2, 0. albida 3, O. oblonga 18. 



Four unidentified types represented by 2, 2, 3 and 3 individuals 

 respectively. 



Culture D. 1. 7. Purely fertilized seed from a Single individual 



