322 ^itronomy. — On the Health of Silk'Wt>rtni4 

 Ephemeris of Festa at Midnight. 



1808. Appar. A.R. Dec. S<,uth. .^e Meridian. 



• ' ' h. ' 



Sept. 28 3t7-9 18 38 10-48 



Oct. 1 3'lG-35 18-47 10-35 



4 ^46-5 18 53 10-22 



7 345-3«J 18-55 10-9 



10 345-16 18-50 9'57 



13 344-58 18-53 9*45 



16 344-45 18-49 9*33 



19 344-36 18-41 9-2l 



22 344-32 18-3I 9*9 



25 344-32 18-20 8-57 



28 344-37 18-5 6-46 



31 344-46 17-49 8-35 



Nov. 3 345-0 17'31 6-24 



6 345-18 17-11 8-14 



9 345-40 16-50 8-3 



12 346-5 16-28 7-52 



15 346-34 16-4 7-43 



18 347*7 15-38 7-32 



21 347*43 15-11 7 22 



24 348-21 14-44 7*12 



27 349-3 14-15 72 



30 349-48 13-45 6-52 



ON THE HEALTH OF STLK-WORMS *. 



An Insenious member of the academy of Ni-smes, M.Alex- 

 ander Vincens, has made a discovery relative to the health 

 and nourishment of silk-worms, which may be of consi- 

 derable advantage to the breeders and keepers of these cu- 

 rious insects in this country. " Experience," says the au- 

 thor of this discovery, " has demonstrated, that the primary 

 necessity of the aurelia of the inject which yields us silk, is 

 an atmosphere abounding in oxygen, and that nothing is so 

 injurious to it as impure air mixed with foreign vapours. 

 Silk-worms prosper in the mountains : the north winds 

 vivify them, by causing a more pure fluid to circulate between 

 the layers of reeds on which they are placed ; but they lan- 

 guish and decline in the vicinity of marshes, and under the 



» From Transactions of the Academy of Card (Nisme^) for 1806. 



relaxing 



