300 MANIPULATION. 



the excess will escape at the sides, and if the pouring be kept 

 up for a few minutes, all the bubbles and foreign bodies in the 

 liquid which may have been washed from the preparation 

 win be removed. The cement employed for the cover by 

 Mr. Goadby was gold-size and lamp-black, but Mr. Dennis 

 adopts the following plan: — In the covers of large boxes he 

 drills a small hole, and fits a cork into it, and places the pre- 

 paration in the cell with sufficient fluid to cover it, but not 

 enough to reach within half-an-inch of the top. He then 

 cements on the cover with marine-glue by means of a hot 

 iron, and fills up the box with the preservative solution 

 through the hole ; by a little shaking, all air bubbles can be 

 got out, the box should be allowed to remain a few days, and 

 when no more bubbles make their appearance, the cork is 

 put in and cut off level with the top of the cover, and a thin 

 piece of glass is cemented over it to keep it in its place. All 

 the joints of the box are now cemented with marine-glue, and 

 the cover, being fastened on with the glue, is held much more 

 firmly than by any of the other more liquid cements. 



A small box, a b, with mitred sides, c c, and strengthened 

 both with angle pieces in the inside and strips on the outside, 

 d, is represented by fig. 204 ; this will be found to be a much 



Fig. 204. 



more durable kind than that shown by fig. 199. If the pre- 

 paration to be mounted in one of these boxes be required 

 to be kept in the middle of the box, or if it be necessary that 

 any part of it should be spread out for its better display, the 

 plan adopted by Mr. Goadby is to secure it with fine pieces of 

 silk or China twist; for this purpose he employs loops of 

 strong silk, which are fastened to the bottem or sides of the 

 box either with marine-glue or Canada balsam, to these the fine 

 pieces of silk attached to the preparation may be tied ; short 



