462 



NATURE 



[September io, 1891 



of the larva. They differ, to the eye at least, almost as much 

 as air differs from water. 



Of the friends to whom I am indebted for help, I must specially 

 name my fellow-worker, Mr. Arthur Hammond, who has com- 

 municated to me many results of his own observations, and has 

 <irawn most of the illustrations shown this evening. My col- 

 league, Dr. Stroud, has very kindly arranged, and in some cases 

 devised, the physical experiments which have been so helpful 

 to us. 



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