ADDRESS ro SUBSCRIBERS. 



The Proprietors beg leave to apprize the Subfcribers 

 to this Work, that, in future, the Letter-prefs for two Num- 

 bers will be publifhed together, but that the Plates will be 

 fold in monthly Numbers as ufual. — B7 this mode of publi- 

 cation the Subfcribers will be in poffeffion of the Defcriptions 

 before the Plates are publifliedj and the Proprietors will 

 avoid a very heavy Stamp-duty. 



By an Ad of the Legillature in the reign of Queen 

 Anne *, a Duty was impofed on all Pamphlets ^ not exceeding 

 One Sheet, or fixteen Pages, of Letter-prefs in Oftavo; but 

 as that regulation was probably intended only to reprefs the 

 circulation of Pamphlets of an immoral or feditious -j- nature, 

 the CommifTioners of the Stamp-duties have never demanded 

 this Duty, on periodical Publications of a Scientific Nature, 

 though the Numbers of every Work are regularly entered at 

 the Stamp-Office, and a Duty paid on them within fourteen 

 days after their publication. The Commiffioners have, 

 however, now determined to exa6l this additional Duty, and 

 have fignified to all PubHlhers, that in future a Duty muji be 

 "paid on every Copy of every Pamphlet^ not exceeding One Sheets 

 as the Law direfcs j and farther that the Stamp muft be im- 

 preffed on the firft page of every fuch Pamphlet, as on Al- 

 manacks, Newfpapers, &c. We conceive therefore tliat it 

 will be far better to adopt this mode of avoiding fuch Duty, 

 and having every volume of our Work disfigured hy twelve 

 Stamps in the face of the Letter-prefs. 



The Natural History of British Birds will be pub- 

 lifhed in the fame manner. 



* 10 Ann. c. 1 9 . y. I o I . 



f School-Books, Books of Devotion, Ails of Parliament, &c. are exprefly 

 exempted. 



