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Description of a Zoophyte Trough, Live Box or Growing 



Slide. 



By the Rev. H. J. Fase. 



(Communicated Feb. 2nth, 1881.) 



This arrangement is shown in plan view with the cover removed 

 at Fig. 1, and in transverse vertical section at Fig. 2. In those 

 figures A is a glass plate, 3 inches in length by 2^ inches in width, 

 to which is cemented a stout bone or ivory ring B, -fths of an inch in 

 height, having a thin lining of cork C, cemented to it. D is a shorter 

 tube of ivory or bone, furnished at the top with a broad flange, and 

 closed at the bottom by a disc of thin cover-glass E. This tube D 

 slides freely in the cork-lined tube B. A narrow slot F, is cut in 

 the inside of the tube B, from the top outside, sloping to the 

 bottom inside, for the purpose to be presently explained. 



To use this apparatus as a Zoophyte trough, a ring of indiarubber 

 G, cut through as shown at H, in Fig. 1, and of a thickness suitable 

 to the object to be examined, is placed as shown at the bottom of the 

 tube B. The object is placed in this ring with a little water, and the 

 cover is then pressed down gently, any excess of water flowing out of 

 the cut in the indiarubber ring into the box. For use as a growing 

 slide a ring of indiarubber or of gutta-percha tissue is placed as 

 before in the bottom of the box (but in this case the cut in the 

 ring is to be placed as indicated by the dotted lines in Fig. 1), 

 the object to be examined is placed within the ring, and water added 

 through the slot F, which passes into the box outside the india- 

 rubber ring. 



Water may also be added to supply the loss from evaporation 

 from time to time, through the slot F in the ring B, which slot may 

 be closed by a plug of cotton wool, to exclude dust and prevent 

 evaporation. 



When it is desired to use the apparatus as a live box, the india- 

 rubber ring may be dispensed with. The object is placed in the 



