29 



A lump of camphor maybe placed in a piece of cotton cloth and 

 pinned firmly in the corner of the box containing dried insects, for 

 the purpose of preventing the ravages of larvae. A few drops of 

 kreosote occasionally introduced will also answer the same purpose. 



Fig. 2. 



Sea-urchins and starfishes may be dried, after having been pre- 

 viously immersed for a minute or two in boiling water, and packed 

 up in cotton, or any soft material which may be at hand. 



The hard parts of coral, and shells of mollusca may also be pre- 

 served in a dried state. The soft parts are removed by immersing 

 the animals for a minute or two in hot water, and washing clean 

 afterwards. The valves of bivalve shells should be brought to- 

 gether by a string. 



Wingless insects, such as spiders, scorpions, centipedes or thou- 

 sand-legs, earth-worms, hair-worms, and generally all worm-like 

 animals found in the water, should be preserved in alcoholic liquor, 

 and in small bottles or vials. 



? V. EMBRYOS. 



Much of the future progress of zoology will depend upon the 

 extent and variety of the collections which may be made of the 

 embryos and foetuses of animals. No opportunity should be 



