66 RAMBLES OP A NATURALIST. 



CHAP. II. 



THE ARCHIPELAGO OF BREHAT. 



Journey from Paris to Paimpol. The Archipelago of Brehat. Its 

 geological structure. Ruins on some of the inhabited islands. 



Grande- He. Le Paon Population ; probable admixture of 



Basque and Breton blood. Mildness of the climate. The 

 terrestrial Fauna ; the Black Rat. The maritime Fauna. The 

 animal series. Ideal and derivative types. Relations of or- 

 ganised beings to one another. General ideal type of a perfect 

 animal. Division of physiological labour. Higher and lower 

 animals : organic permanence of the former ; organic variability 

 of the latter. Subdivision of the Articulata. True Annelids or 

 "Worms. Tubicolous Annelids ; Chloroema ; Amphicora ; Tere- 

 bella ; Sabella. Errant Annelids ; Chaetopterus ; Echiurus ; 

 Sipunculus; Dujardinia. Anatomy of Eunice sanguinea. 

 Doyerina ; Aphlebina. Organisation of Nemertes ; remarkable 

 simplification. Excursion to the lighthouse of Hehaux. Descrip- 

 tion of the tower. Illuminating apparatus. Historical notices: 

 Borda, Lemoine, Buffon, Arago, Fresnel, the younger Fran9ois. 

 Departure from Brehat. 



I HAD left the Archipelago of Chausey and the 

 harbour of St. Malo, firmly resolved, some day or 

 other, to revisit the shores of Brittany. The four 

 months which I had spent in earnest research had 

 indeed familiarised me with the zoological riches 

 of its sandy coast, and its granite-guarded creeks 

 and bays ; but the profound study of even the 

 smallest animal demands prolonged and assiduous 

 investigation. Much had been left undone on my 



