14 THE BUTTERFLY VIVARIUM. 



In order to place the continually occurring 

 wonders of my rearing case in a condition for more 

 convenient observation, I conceived the plan of a 

 glass Vivarium, of a form somewhat similar to that 

 of a fern case, but with additions and modifications 

 suited to its special purpose. The Frontispiece to 

 this volume represents such a case. It is a front 

 view ; and, being intended for rearing aquatic as 

 well as land insects, a portion of the interior is set 

 apart for a small reservoir of water, starting from 

 the front angles of the case and curving backwards 

 in the form of a little bay. The water-tight separa- 

 tion forming this little reservoir consists of a piece 

 of sheet-zinc of the necessary height. It is soldered 

 to the bottom of the Vivarium, which is also formed 

 of zinc ; and up the front angles it is equally 

 soldered to the zinc uprights or columns. The 

 reservoir has, therefore, its back and sides formed 

 of zinc, and its front of glass, the joint at the bottom 

 of the glass, witb the zinc floor, being rendered 

 secure by means of cement. The semicircular 

 course backward of the water division is intended 

 not to extend above half the depth of the Vivarium, 

 even at its furthest point, in the centre, so as to 

 leave ample space for the land arrangements, which, 

 in the two back angles, will thus form a consider- 



