4 ze 
AND SPECIES HYBRIDS WITHIN THE GENUS SACCHARUM 131 
grains, shortly after the Splitting apart of the tetrad are seen in 110025. 
The figures give pictures of normal, generally occurring, division- 
stages of PMC of Saccharum spontaneum. Divisions proceeding in an- 

Big. 22. Fig 23. 
Fig. 22. Anaphase of the homotype division of Saccharum spontaneum (Glagah 
alas Djatiroto) viewed from the side x 2300. 
Fig. 23. Formation of the cellwalls in a pollen-tetrad of the same plant x 1750. 
other way did not occur in the forms investigated of this species. But 
very rarely slight division-irregularities were met with. 
The results obtained consequently were: 
1. Saccharum spontaneum has a perfectly normal reduction-division. 
2. During the prophase of this division 56 pairs of chromosomes are 
formed. 
3. In the nuclear plates of the homotype division 56 chromosomes. 
are present. 
4. Consequently the nuclei of the pollengrains obtain 56chromosomes. 
In nuclear plates of the vegetative celldivision in root-tips the deter- 
