42 Linkage Group III. 



in this case, and since these two genes are involved in two other 

 experiments, giving larger counts, the latter are used for calculating 

 the map distance. 



The probable order of the genes in group III has been considered 

 above and it remains to estimate the length of the map regions. 



With the locus of scaly as the zero-point, the distance to spread 

 is estimated as about 21 units on the basis of experiment 56. Since 

 spread and hunch can not be used together satisfactorily, hunch is 

 located with reference to scaly rather than spread. The value 

 believed to be most reliable is that obtained from experiments 60 

 and 61, counting only the scaly flies. This is approximately 31 

 units. The hunch-telescoped value is also taken from these two 

 experiments, giving an average of approximately 17 units. Tel- 

 escoped is accordingly placed at 48 rb on the map. The telescoped- 

 garnet value of 43 units is taken from experiment 61. This places 

 garnet at 91 on the map, and it seems probable that subsequent 

 data will increase this to well over 100. 



