TO CORRESPONDENTS. 
Twelve copies of every original communication, pu blished in this Journal, are if request 
ed at the disposal of the author. Any larger number of copies will be furnished at cost, 
- Aushors should: always specify at the head of their MSS. the number of extra copies — 
they may vis! p ms are dapigcyirs up. 
“Notice always to be given when communications sent to this Scientia have been, oF 
are to be, published also in other Journals. i 
Our Bish corespondent are requested to forward all Seana and prec to oe 
