Fig. 2.1 — Allium roots. A, untreated; B, treated; and C, photomicrograph of section from 

 treated root. A. Roots grown in tap water do not show enlargement. B. Colchicine solu- 

 tion of 0.01 per cent causes spears, or coichicine-tumors. This group was one of the orig- 

 inal tests run in 1937 at Co.d Spring Harbor, Long Island, N. Y., by Eigsti. C. A photo- 

 micrograph prepared specifically for this monograph, from a slide of sectioned root tip 

 made in the Brussels laboratory, 1934 to 1937, and presently with the A. P. Dustin 

 Collection, University of Brussels. The polyploid numbers can be seen, as well as large 

 multinucleate cells, amoeboid nucleate cells, and pseudospindle. Similar views were 

 illustrated by Havas, Dustin, and Lits in 1937. 



