217 



N. minor) consist of 14 cylindrical chromosomes, 10 long ones and 

 10 short ones. 



2. N. fes talis. 



a. Diploid varieties. 



The somatic nuclei of TV. muticus (syn. ahscissiis), Capax plenus 

 (which perhaps ought to be classed under N'. minor), Telawonius 

 plenus (Double Sion, Wilmer's great double golden yellow Daffodil), 

 large old double yellow trumpet Daffodil) also comprise 14 chromo- 

 somes which I cannot distinguish from the former ones. 



b. Heteroploid varieties. 



N'. Johnstoni Queen of Spain possesses somatic nuclei with 20 

 chromosomes. In Maximus and Golden Spur these nuclei consist 

 of 21 chromosomes, so that judging from the number these varieties 

 are triploid. 



The nuclei of Bicolor Victoria and Buttonhole (obtained from 

 Bicolor Victoria by budvariation) contain 22 chromosomes. The 

 chromosomes-garniture of both forms is the same. 



The varieties King Alfred and van Waveren's Giant are, to judge 

 from the number of chromosomes, tetraploid, for here the somatic 

 nuclei consist of 28 chromosomes. 



In all the 14 forms above-mentioned and examined, the chromo- 

 somes — both long ones and short ones — correspond in size and 

 shape. The diploid nuclei always consist of 10 longer and 4 shorter 

 chromosomes. I cannot yet state the exact number of long and short 

 chromosomes of the nuclei of the heteroploid forms. To do this it is 

 necessary to examine over 3000 good sections with dividing nuclei; 

 I have now examined this number. Probably the longer and shorter 

 chromosomes do not differ in length and breadth from each other, 

 and as in Hyacinthus orientalis the pairs of long and short chromo- 

 somes will not be distinguishable from each other by any characteristic 

 constant difference in form, as is described of N. poeticus by 

 Stomps (3). 



III. Self-pollination in diploid, triploid and tetraploid forms. 



In contrast with Hyacinthus orientalis, in such categories as can 

 be distinguished cytologically, self-pollination yields good practical 

 results. From the few seeds of the diploid N. minimus, minor, 

 cyclamineus (and K.triandrus albus), taken in 1913, 1914 and 1915, 

 I have reared plants which are not distinguishable in bulb leaf and 

 flower from the parent species. 



In the case of the triploid Golden Spur self-pollination yielded 



14* 



