Sparrow, A. H., 1942. "The Structure and Development of the Chromosome 

 Spirals in Microspores of Trillium," Can. J. Res., D, 20, 257-266. 



Sparrow, A. H., Huskins, C. L., and Wilson, G. B., 1941. "Studies on the 

 Chromosome Spiralization Cycle in Trillium," Can. J. Res., C, 19, 323- 

 350. 



Swanson, C. P., 1942. "Meiotic Coiling in Tradescantia," Botan. Gaz., 103, 

 457-474. 



Wilson, G. B. and Coleman, P. G., 1952. "The Ontogeny of Chromosome 

 and Chromonema Spirals. A Re-evaluation," Cytologia, 17, 270-278. 



Wilson, G. B. and Huskins, C. L., 1939. "Chromosome and Chromonema 

 Length During Meiotic Coiling in Trillium erectum L.," Ann. Botany, 

 New Series, 3, 257-270. 



Wilson, G. B. and Hutcheson, I., 1941. "Further Studies on Changes of 

 Direction in the Major Coil of the Chromonema of Trillium erectum L.," 

 Can. J. Res., C, 19, 383-390. 



Wilson, G. B., Sparrow, A. H., and Pond, V., 1959. "Sub-chromatid Re- 

 arrangements in Trillium erectum. I. Origin and Nature of Configurations 

 Induced by Ionizing Radiation," Am. J. Botany, 46, 309-316. 



THE CHROMOSOME COILING CYCLE / 173 



