328 New Publications. 
déllarsin point oflabour.—VIT. Obfervationson'the Strenatty 
6f the Walls of Fortifications, by A. Sjoberg. \ The author! 
prefers the theory of Stakl{verd; in’ regard'to fortification) to: 
thofe of Lorgna, Delanges, and Woltmann's a more accus' 
rate account of this theory has been given in Bohm’s Ma= 
gazine for Engineers; but Stahlfverd is’ too fhort, and in) 
fome parts he has not fufficiently explained his calculations. 
He has alfo employed fluxions fometimes with long eonverg- 
ing feries, though it might have been poffible by other me- 
thods’ to approach nearer to the objeét. M. Sjoberg, there+ 
fore, has begun here to improve and explain this theory, — 
VIII. Farther Examination of the Black Stone of Ytterby, 
~ and the peculiar Earth found in it, by A. G. Ekeberg. The 
author continued the experiments made by Gadolin on this 
fubje&t, and found in roo parts 47% of a peculiar earth, dif- 
ferent from all ‘the other kinds of earth* hitherto known, 
and towhich he gives the name of ¥'tter earth, Yitrica, The 
ftone itfelf he calls Ytter ftone. 
~ Jn the third part we find the following papers: I. Some’ 
new Moths of the Genus of the Tortrices, by C. P. Thunbere, 
fiich as, 1. Tortrix Fablbergiana : alis bafi' cinereis ‘apie 
pirpureis ; flrigis albidis ; frony the iffand of St. Bartholo-~ 
mew in the Weft Indies. 2. T: Stickmanniana, alis*éex- 
herne fufcis interne albis, linea media ferruginea abbreviate. 
4.T. Liunghiana : alis albis punétis fufcis irroratis; fafetis 
tribus fufcis. 4. T. Achariana : alisplumbeis, fafciis duabus 
nigris, inferioribus margine albis. 5. T. Blomiana: alis plum~ 
~ beis Juperioribus, arcu fafciague abbreviata obliqua atra. 6.T: 
Naezeniana, alis purpureo-aureis ; maciilis ofo flavis, antennis 
ennulatis. All thefe are found ‘in Sweden, ‘and have’ been 
flamed after the Swedifh naturalifts by whom they were dif+ 
éovered: Il. Wefiringia, a new Genus of Plants deferibed 
by J. E. Sinith, M-D, Prefident of the Linnean Society of 
London. © It was firft difeovered in’ New Holland by Dr. 
Solander, who éalled it Cunila fruticofa, though it is totally 
, different,” ‘ahd has rather a apiahac to rofemary, from 
which, 
