CONTENTS. 



General view of the structure and physiology of 



Sponges, ----- Page 5 — 22 



Their various structures, . . - 5 — 6 



Their habitat, - .. . . 9—10 



Their manner in growth, . - . 10 — 12 



Their circulation, - „ - 12 — 15 



Their food, . - - - 15 — 17 



Their propagation, . . - 17 — 19 



Their geographical distribution, - - 19 — 20 



Their uses, - - - . 20—22 



History of Discoveries of the Nature of Sponges, - 23 — 69 



Opinions of Aristotle, . - . 23 — 27 



Pliny, - . - . 27—28 



Gerarde and Imperato, - - 29 



Ray, . - - . 29—30 



Linnaeus and Marsigli, - 30 — 31 



Donati and Peyssonel, - - 31 



Ellis and Pallas, - - 32—33 



Linnoeus, . . _ 33 



Spallanzani, - - 33 — 34 



Cavolini, - _ - 34, 



Montagu, - - - 35—37 



Bosc and Cuvier, - • 37 — 38 



Lamouroux, ... 38 — 39 



Lamarck, . . - 39 — 4,9 



Schweigger, - - 40 — 42 



Gray and Bell, - - 42 — 45 



Grant, - - - 40—56 



Audouin and Milne-Edwards, - 57 — 58 



