Sect. XL] 



ZOOLOGY. 



349 



4 



v^- 



^ H 



I. 



reefs, atolls, or coral-islands, may be preserved m the 

 above solution, provided they be killed by its gradual 



application as above described, and be afterwards trans 

 ferred into fresh solution. With regard to the structure 

 and formation and mode of observation of coral islands 

 and reefs, the work by Charles Darwin, Esq., On the 

 Structure and Distribution of Coral Reefs (8vo., 1842), 

 should be consulted.* Never fail to ascertain, if possible, 

 to what depth below the surface of the sea the corals 

 descend, and on what basis they rest ; and for particular 



instructions with reference to coral reefs, see 



Bar 



win's 



remarks under the head of ' Geology.' 



« 



(i; 



Lt; 



-J . 



v-- 



If 



Infusorial Animalcules {PoJyijoMria, P olythalawia ^ 



Phi/tolitharia) ^ 



Some idea of the value and importance of attending to 

 the collection of these microscopical orQ:ani2;ed beingrs 



o 



e^ 



may be had by reference to Ehrenberg's Observations 



forming Appendix No. V, of Cc 



Sir JaTnt;o C 



Eoss's ^ Antarctic Voyage/ vol. i. p. 339 ; a bett^^^ idea 

 by the perusal of Ehrenberg's numerous communications 

 to scientific journals, some of which have been translated 

 in Taylor's ^ Annals of Science ;' and the best idea by 

 the study of Ehrenberg's great work, ' Entwickelung, 

 Lebensdauer uud Struktur der Magenthiere und Badcr- 

 thiere,' &c., foL, 1832. The important relatioi 



"1 1 r ^ *^ 



f tl 



lese 



minutest forms of animal life to great questions in geo- 



logy, to the alteration of coast-lines, and to the phenom.ona 



See also, on this subject, Lieut. Nelson's paper ' On the Geology of 

 the Bermudas;' Geological Transactions, 2nd Series, toL y. pp. 103~- 



123. 





