NOTES AND CORRESPONDENCE. 



Colour of the Sea — As a pendant to the admirable paper 

 by Dr. Collingwood, published in the April ' Quarterly Micro- 

 scopical Journal/ permit me to send you the following notes. 



During the voyage of this vessel from Valparaiso hither, 

 at the end of last and beginning of this month, the sea was 



noticed to be sensibly discoloured for about 500 miles. Some 

 sixty miles south of Callao (lat. 13° south) the colour was 

 brownish-green ; close to and at about ten miles from Callao 

 the sea was covered by many patches of thick reddish-brown 

 This occurred at intervals ; but more to the north. 



scum. 



off the Lobos Islands, the scum had disappeared, and there 



