NO IV TO MAKE IT. 



9 



CHAPTER II. 



HOW TO MAKE IT. 



JHE much-quoted culinary recipe for jugged-hare 

 insisted on the hare being obtained before pro- 

 ceeding further, but in the present case we must 

 first obtain the vessel which is to become our aquarium. 

 So long as the conditions insisted on in the preceding 

 chapter are observed, the shape and size of the vessel is 

 of minor importance. A successful "aquarium can be 

 maintained in a washing- 

 tub, though for purposes of 

 observation this form is not 

 to be recommended. The 

 same objection applies to 

 large earthenware pans. But 

 undoubtedly the best form 

 for observation is a vessel of 

 a more or less square or rectangular form, having one, 

 two, or three transparent sides and an opaque back. 

 Fig. I represents such a case, in which it will be observed 

 the light would come from the top, that is, if the opaque 

 back were turned towards the light. The depth should 

 not be so great as the length, and the endeavour should 

 be to offer a comparatively large surface to the purifying 

 contact of the air. Regarding the materials of which the 

 framework is constructed, there is considerable variety 



Fig. I. 



