COKRESPONDENCE. 55 



Plate VIH. 



Fig. 1. — Hollyhock Beetle, Ealtica fuscipes, x 15. 



Drawn by J. C. Carpenter. 



,, 2. — American Potato-Beetle, Dorypliora decem-punctata. 



3. — Larva of Puss-Moth. 



4. — Larva of one of the Geometridce. 



Drawn by E. Lovett. 



,, 5. — Young Larva of Puss-Moth, from a mounted slide. 



Drawn by Tuflfen West. 



5) 



Corresponbence. 



The Editors do not hold themselves responsible for the opinions or 

 statements of their Correspondents. 



To the Editor of the Journal of Microscopy a7id Natural Science. 



" POND LIFE." 

 Sir,— 



Mr. Hoyle, in his paper on " Pond Life," in the October 

 number of this Journal, gives, in four pages, a brief account of 

 the Infusoria, which contains so many mis-statements, some of 

 them of a very important nature, that it seems worth while 

 correcting them. I will take them in the order in which they 

 occur. 



I. — It is stated on p. 248 (Vol. IV. of this Journal), that it is 

 an open question whether the eye-like pigment spot of the EuglencR 

 is really an eye or not. Accurate observations are said to be 

 needed, and to be difficult on account of the activity of the 

 animal. 



NaturaHsts, generally, have given up the idea that these spots • 

 are eyes. They are considered to be oily or pigment corpuscles, 

 resembling the isolated coloured corpuscles possessed by many 

 unicellular plants. It is easy to reduce the activity of EuglencB 

 to any extent required. Engelmann's recent researches show that 

 while Euglena, like some other Infusoria, is sensitive to light and 

 darkness, and is differently affected by the different rays of the 

 spectrum, this result is not due to the eye-spot, for the motion 

 begins before the shadow reaches the eye-spot. 



2. — " They illustrate one group of the Infusoria, characterised 

 by having one long hair-like process, whence they are known as 

 Flagellata." 



