V. Observation of an extraordinary Height of the Ba- 
rometer^ December zi. 1721. By Mr. George Gra- 
ham, Watchmaker , F. R. S. 
r -• — 
VI. A Caution to be ufecl in examining the Specifick 
Gravity of Solids by weigh mg them in Water . By 
James Jurin, M. D. R. S. Seer. 
VII. A Letter fromMr. Edward Naifh, Surgeon in York, 
to Claudius Amyand, Efq; Serje ant-Surge on to his 
Majefiy^and F. R. S. Concerning an OJJifi 'cation of 
the Crural Artery. 
VIII. An Account of a Rainbow feen on the Ground. 
Communicated in a Letter from the Reverend Benja- 
min Langwith, D. D. Reef or of Pet worth, to Dr. Ju- 
rin, Seer. R. S. 
IX. Epiftola Domini Antonij van Leeuenhoek, R. S.'S, 
de Ofculis, five Spiraculis Folio rum Buxi , item de 
lanugine Malonnn Perfccrum & Cydoniorum. 
X. Remarks on fome Attempts made towards a perpetital 
Motion , by the Reverend Dr . Defaguliers, F. R. S. 
XI. A Method for rowing Men of War in a Calm . 
Communicated by Monfieur Du Quef. 
XII. Fart of a Letter from the Reverend Mr. Rowlands, 1 
to the Reverend Mr. Derhar 
and F. R. S. Concerning 
Mene with Oyflers.. 
