236 CORRESPONDENCE. 



" I use ordinarily a solution of tLe ammonio-sulpliatc of copper, which 

 gives a bluish-violet light, ajjproximatiug mouochromatism sufficiently 

 for all practical demands." If the rays of light which fall on the 

 mirror of the microscope are previously sent through this solution 

 the whole thing will be achieved. We trust we have rendered this 

 sufficiently clear to an " Amateur." 



COEKESPONDENCE. 



Portion and Number of the Cilia in (Ecistes. 



To the Editor of the '■Monthly Microscopical Journal.^ 



St, James's Mount, Liverpool, 

 April 15, 1871. 



Sir, — Will you allow me to correct Mr. Charles Cubitt's statement, 

 made in the concluding paragraph of his recent paj)er " On the Winter 

 Habits of the Eotatoria," reported in your last number. 



As to the charge that I was " unable to detect the second wreath 

 of cilia on the lobes of the tube-dwellers," it is most singular that he 

 could overlook the following paragraph (page 42 of the Journal for 

 January last) : — 



" Mr. Chantrell pointed out a marked characteristic in the mature 

 specimens of the (Ecistes crystallinus, which is the second row of cilia, 

 carrying the food in right and left currents to the gullet or mouth : 

 this does not show in the young specimens, which are always in tubes, 

 but as they get larger the tube gradually disappears." 



Further, I exhibited at that time a large drawing I had made of 

 the (Ecistes crystallinus, contrasting the illustrations of this animal, 

 copied from Pritchard's ' Infusoria,' the ' Microscopical Dictionary,' 

 Slack's ' Marvels of Pond Life,' and from the drawing of (Ecistes inter- 

 medias accompanying Mr. Henry Davis's (F.E.M.S.) paper " On (Ecistes" 

 (published in the Royal Microscopical Society's ' Transactions'), with 

 my drawings from life of old and young (Ecistes, showing in Fig. 1 a 

 well-defined second loreath of cilia, and none in the others. This draw- 

 ing I have had photographed, and I herewith send you a copy. 



Some months ago I sent Mr. Davis several specimens of (Ecistes, 

 as also of Floscularia, from the Windsor pond. We were both clear 

 about the second row of cilia, but differed in opinion as to whether the 

 cilia were inside or outside the disk, I believing the former. 



IVIi". Davis (whom Mr. Cubitt quotes as an authority on tube- 

 dwellers) quite agrees with me that there is an entire absence of the 

 transjMrent tubes in the Floscularia I sent him. 



I am. Sir, yours truly, 



G. T, Chanteell. 



[Mr. Chantrell has sent a series of photographs, which, however, 

 it is quite unnecessary to reproduce. — En. ' M. M. J.'] 



