H. MUNRO FOX 573 



5. Using this method with the red Chironomus larva similar con- 

 clusions were reached for carbon dioxide output as for oxygen intake. 



The work was done in August and September, 1919, at the Labora- 

 tory of the Marine Biological Association, Plymouth. I wish to 

 thank the Director and staff for their constant kindness and assist- 

 ance. I wish also to thank the trustees of the Ray Lankester Fund 

 for having nominated me to an Investigatorship and Sir Ray Lankester, 

 K.C.B., F.R.S. for having lent me a microspectroscope. 



