. Animal activities; a first book in zooÌlogy. Zoology; Animal behavior. MATERIAL FOR STUDY. 19 The cyanide bottle described in Part F of Bulletin No. 39, U. S. National Museum, can be used instead of the tumbler if desired. Animals larger than insects may be killed by chloroform or ether. Earthworms should be killed in dilute alcohol. Starfish and sea- urchins are often killed by placing them in hot, but not boiling, water. Preserving Specimens in Alcohol. Part M of Bulletin No. 39 already mentioned gives valuable directions for the preservation of specimens. Alcohol is the most important pre
. Animal activities; a first book in zooÌlogy. Zoology; Animal behavior. MATERIAL FOR STUDY. 19 The cyanide bottle described in Part F of Bulletin No. 39, U. S. National Museum, can be used instead of the tumbler if desired. Animals larger than insects may be killed by chloroform or ether. Earthworms should be killed in dilute alcohol. Starfish and sea- urchins are often killed by placing them in hot, but not boiling, water. Preserving Specimens in Alcohol. Part M of Bulletin No. 39 already mentioned gives valuable directions for the preservation of specimens. Alcohol is the most important pre- â â ^ ,, â ., T- 1 â Fig. 28.âTumbler servmg fluid. For most specimens ^jth chloroform. 50^ alcohol should be used at first. Drawn by A. E. This should be changed in a few Sanford. days to a stronger solution, about 60^. If the speci- mens are to be permanently kept they should be transferred again to joi alcohol. Strong alcohol as bought of the dealers is about 95^ pure. This should be diluted some days before the specimens are put in it, to prevent the collecting of bubbles on the surface of the animals. Parts of animals for dissecting should be hardened gradually in alcohol. Hydras, hydroids, snails, mussels, and worms are best kept in alcohol. Preserving Specimens in Formalin. This liquid as usually bought is a solution of formaldehyde in water. For most purposes it should be diluted with water to make a 2^ solution. Specimens to be used are kept in this fluid. Dried Specimens. For class use, butterflies may be kept in a tightly closed box containing naphthalin or camphor. Such specimens usually need to be preserved for a few months at most and can then be thrown away. Dragon-flies and other insects may be kept in the same box. Starfish may be dried by a slow heat after immersing for a time in hot water, not boiling, or after fjradually hardening in alcohol. Sea-urchins may be. Please note that these images are extracted from scanned page images that may have been d
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