196 BOTANICAL GAZETTE [SEPTEMBER 
a side-by-side pairing of chromatin threads (parasynapsis) to form a 
double spirem; the other involving an end-to-end arrangement 
(telosynapsis) of the maternal and paternal chromosomes to form 
a single spirem, which may afterward split longitudinally. 
5. The behavior of the chromosomes in Oenothera supports the 
view of their genetic continuity from generation to generation, the 
number present in any individual being always the sum of the chromo- 
somes in the germ cells from which that individual was formed. 
6. If the chromosomes of Oenothera are unlike in their hereditary 
capacities their behavior furnishes a not improbable basis for the 
phenomena of mutation in Oenothera Lamarckiana. But it remains 
to be proven that the chromosomes of Oenothera are of unequal 
hereditary value. 
THE UNIVERSITY OF CHICAGO 
LITERATURE CITED 
1. ALLEN, C. E., Nuclear division in the Aspe mother cells of Liliwm canadense. 
Annals of Botiaty 19: 189-258. pls. 6-9. 1905. 
. Bercus, J., Le fuseau hétérotypique de Paris quadrifolia. La Cellule 22: 
203-214. pls. 2. 1 
Boveri, T. echuie iiber die Konstitution der chromatischen Substan? 
des Peltier, pp. 130. figs. 75. Jena. 1 d 
, Zellen Studien V. Ueber die Abbingigkeit der Kerngrésse uD 
Zellenzahl des Seeigel-Larven von der Chromosomenzahl der Ausgangszellen. 
pp. 80. pls. 2. figs. 7. Jena. 
5. DeVries, H., Bastarde von ecahien gigas. Ber. Deutsch. Bot. Gesells. 
26a: 754-762. 1908. 
. Etsen, G., Speimstogenesis of Batrachoseps. Journ. Morph. 17: i 
pls. 14. 1900. 
ErpMANN, R., Experimentelle Untersuchung der Massenverhiltnisse vo? 
P a, Kem, und Chromosomen in dem sich entwickelnden Seeigelei. 
Arch. Zellforsch. 1:76-136. 1908. ee 
8. Gates, R. R., Pollen development in hybrids of Oenothera lata XO. Lama 
kiana, and its feisGen tomutation. Bor. GAZETTE 43:81-115- pls. 2-4- er 
, Hybridization and germ cells of Oenothera mutants. Bot. GazeTTe 
i) 
Y 
a 
i 
44: 1-21. figs. 3. 1907. ; vt 
10. e chromosomes of Oenothera. Science N. S. 27: ease 
Ir s study of reduction in O¢enothera rubrinervis. BOT 
46: sag pls. 1-3. 1908. 
yon 
. GEerTs, J. M., Beitrage zur Kenntnis der cytologischen Entwicklung 
Oenothera Pomatchlen Ber. Deutsch. Bot. Gesells. 26a:608-614- * 
Lal 
N 
