



Si:.>^ 



Fig. 37. Radioautograph of the distal segment of the salivary C chromo- 

 some of Rhyncosciara avgelae at three different stages of larval develop- 

 ment. The larvae were fixed 24 hr after receiving an injection of ^H- 

 Thymidine. Heavy blackening shows localized strong incorporation of 

 thymidine (Ficq et al., 1959) (courtesy Dr A. Ficq). 



