1852-54 
DARWIN’S CIRRIPEDIA 
407 
that the town should reap the full benefits of 
the water supply. For that purpose the supply 
must be directed, by combined sewage works, 
irrespective of private and public streets, so as 
to carry off the sewerage from every, even the 
humblest dwelling.’ Owen concludes with a 
promise of some further remarks on the ‘ eco- 
nomical and profitable results of the water and 
sewage works viewed merely as an investment. 
In July, Charles Darwin wrote a letter to Owen 
on the subject of the Cirripedia.” Their place in 
the system had occasioned considerable doubt and 
difference of opinion amongst zoologists, but 
Darwin’s researches went far to settle the vexed 
question of their zoological position, and so the 
following letter may be found of interest ; — 
Down, Fai-nborough, Kent : July 17 [1854]. 
‘ Dear Owen, — . ... I cannot tell you how 
much gratified I am at what you say about the Cirri- 
pedia. I really feel rewarded for more labour than 
you would readily believe it possible could have been 
bestowed on the work. I have, however, made a 
mess of it, for I got so frightened at the thoughts of 
all the seaside species, that I have not illustrated and 
given in nearly detail enough my anatomical work, 
» A well-defined natural are scarcely any seas without 
group of marine invertebrate some of the species, as they 
animals, commonly known as frequently fix themselves on to- 
‘ barnacles.’ They are very floating bodies, 
widely diffused— in fact, there 
