392 JS'oticc of the Revue Encydopedique^ &fC- 



This approaches very nearly 2 proportionals of water 

 = 18 — five proportionals of Silex = 80. 



Geological and Geographical Situation. 



It occurs in cavities in massive and other varieties of sin- 

 ter, and upon conglomerated masses of altered lava and 

 pumice, in the vicinity of the hot springs of the island of 

 Saint Michaels, (Azores) and has probably been deposited 

 from the waters which held it in solution by their elevated 

 temperature, aided by an alkali. 



53. Sivainso7i^s Zoological Miscellany. 



,?V o/j'ce communicated by Professor Rafinesque, in a letter 

 dated Lexington, 10th October, 1820. 



I am requested by the author to have the following no- 

 tice inserted in your Journal. 



" Mr. William Swainson of Liverpool, a gentleman who 

 has travelled in Brazils, Greece, Italy, Sicily, &c. was to 

 commence publishing in London, in October, 1820, a Zoo- 

 logical Miscellany, with coloured plates. He is an able 

 naturalist and painter, two qualities which will render his 

 work very valuable. It is to be on the plan of the Zoolo- 

 gical Miscellany of Dr. Leach, where so many new objects 

 have been elucidated, and to contain the figures and de- 

 scriptions of the new animals which he has discovered in 

 his travels. It will be published in monthly numbers, in 

 8vo, each number will contain four highly finished colour- 

 ed plates of new and unfigured or imperfectly known birds, 

 fish, shells and insects, all from original drawings by the au- 

 thor, who has likewise engraved the plates. The price will 

 be two shillings and six pence per number. He has also a 

 monography of the genus of humming birds, with colour- 

 ed engravings of each species, nearly ready for the press." 



57. Notice of the Revue Encyclopedique, published in Paris 

 under the direction of Mr. Julien. 



This Monthly Journal has but recently begun to be 

 known in thi? country. Indeed, its publication began only 



