CONTENTS. 
XXXVII. An Account of an extrordinary Shower of 
black Duf y that fell in the If and of Zetland zoth 
October 1755. In a Letter from Sir Andrew 
Mitchell, of Weltlhore, Bart, to John Pringle, 
M. D. F. R. S. p. 297. 
XXXVIII. A Defcriptionxf fome 'Thermometers for 
particular IJfes. By the Right Honourable the 
Lord Charles Cavendifh, V. P. R.S . p. 300. 
XXXIX. Obfervationes Anatomico-Medi cce de Mon - 
fro bicorporeo Virgineo A. 1701. die 26 Odt. in 
Pannonia, infra Comaromium, in Pof'efione Szony, 
quondam Quiritum Bregetione, in lucem edito , at- 
que A. 1723. die 23 Febr. Poi'onii in Cae nobio Mo - 
nialium S. Urfulae morte funfto ibidemque fepulto. 
Authore Jufto Johanne Torkos, M. D. Soc . Re- 
galis Socio. p.311. 
XL. Obf creations on the Origin and Ufe of the Lym- 
phatic Vejfels of Animals : Being an Ex trail from 
the Gulftonian Lettures , read in the Theatre of 
the College of Phyficians of London, in June 1755. 
By Mark Akeniide, M. D. Fellow of the College 
of Phyficians , and of the Royal Society. p. 322. 
XLI. A Letter to the Right Honourable the Earl of 
Macclesfield, Prefdent , the Council, and Fellows, 
of the Royal Society, concerning the Variation af 
the Magnetic Needle ; with a Sett of Tables an- 
nexed , which exhibit the Refult of upwards of Fifty 
Thoufand Obfervations, in Six periodic Reviews, 
from the Tear 1700 to the Tear 1756, both in - 
c lit five •, and are adapted to every Five Degrees of 
Latitude and Longitude in the more frequented 
Oceans. By William Mountaine and James Dod- 
fon, Fellows of the Royal Society. p. 329. 
XLII. 
