2 JOSEPH HALL BODINE AND PAUL RUDBERT ORR. 



periments. These stocks were obtained from Dr. R. L. King 1 of 

 this laboratory and have been bred continuously by him for many 

 generations. The vestigial stock is a synthetic one carrying two 

 second chromosome mutations, vestigial and black, in homozygous 

 form. 



The stocks were carried along in the laboratory at room tem- 

 peratures in quart milk bottles and fed the usual banana-agar- 



FiG. i. Diagram of modified Krogh micro-respiration app.-irainv ./, front 

 view. B, side view, a, glass-ground stopcock; b, capillary mbin^ with bore 

 of approximately 0.4 mm. in diameter; c, wooden stand for supporting man- 

 ometer; d, glass hooks for holding respiration chamber to manometer by 

 means of elastic bands; c, glass-ground joint; /. jjass sp"on support for 

 organism ; g, kerosene in manometer. 



Note that entire manometer is made of gla*s with ground connections. 



