viii CONTENTS. 
XVI. A Letter from John Zephaniah Hoi well, 
Efq F. R. S. to John Campbel, Efq ; F. R . S. 
giving an Account of a new Species of Oak. 
p. 128 
XVII. An Account of the Death of a Perfon deftroyed 
by Lightning in the Chapel in Tottenham-Court- 
Road and its F feels on the Building -, as ohferved 
by Mr. William Henly, Mr. Edward Nairne, and 
Mr. William Jones. The Account written by Mr. 
Henly. p. 1 3 1 
XVIII. A Letter from Thomas Ronayne, Efq-, to 
Benjamin Franklin, LL. D. F. R. S. inclofng an 
Account of fome Obfervations on Atmofphericat 
Electricity-, in regard of Fogs , Mifs,&c.with 
fome Remarks ; communicated by Mr. William 
Henley. p. 137 
XIX. Obfervations on different Kinds of Air : By 
Jofeph Prieftley, LL. D. F. R. S. p. 147 
XX. An Effay on the periodical Appearing and Dif 
appearing of certain Birds , at different Times of the 
Tear. In a Letter from the Honourable . Daines 
Barrington, Vice-Pref. R . S. to William Watfon, 
M.D. F.R. S. p. 265 
XXII. KOSKINON EPATOZ0ENOrr, or, the Sieve 
of Eratofthenes. Being an Account of his Method 
of fading all the Prime Numbers-, by the Rev. 
Samuel Horfley, F. R. S. p. 327 
XXIII. A Letter from Mr. Chriftopher Gullet to 
Mathew Maty, M. D. Sec. R.S. on the Effebls of 
Elder, in prefer ving Growing Plants from InjeLts 
and Flies. p. 348 
XXIV. A 
