940 



SCIENCE. 



[N. S. Vol. VIII. No. 209. 



in six days large areas were cleaned. la 

 four weeks the work was complete. 



The little crustaceans will not attack any 

 portion of the vascular system of the leaves 

 mentioned until the mesophj'll and palisade 

 cells are all removed and other leaves with 

 mesophyll are lacking. If they are starved, 



is hardly a pool or pond in which some of 

 them are not found. It is quite likely that 

 the food habits of many of them, at least of 

 of the closely related genera, are like the 

 one here described. 



Chqiridojjsk appears to thrive best in 

 water kept fresh by the presence of algce or 



however, they begin on the finer bundles 

 and soon destroy the specimen. It is best, 

 therefore, when all the soft cells have been 

 cleaned off from the bundles to remove the 

 skeleton from the aquarium and press 

 lightly between driers. The figure shows 

 a maple and an ash leaf skeletonized in the 

 experiment described. 



Cypridopsis and related genera are widely 

 distributed in fresh and salt water. There 



other aquatic plants and not inhabited by 

 fish or other animals which prey upon them. 

 They are said, however, to live in dry mud, 

 in a more or less dormant state for long 

 periods. 



Albert F. Woods, . 

 Assistant Chief. 



Division of Vegetable Physiology 



AND Pathology, XJ. S. Depaet- 



MENT of AGEICULTUEE- 



