( 4?7 ) 
("Numb. S 3 4 ’) 
PHILOSOPHICAL 
TRANSACTIONS. 
For the Months of April, June, 1712. 
The CONTENTS. 
I. \ Letter from Mr. Anthony van Leeuwenhoek, F.R.S. Con* 
J \ t dining hit Cbfervatiens upon the Seminal Vrffelt , tAdufcular 
Fibres , and Blood of Whales. 
II. EpifioU D. J. Phil. Breynij, M, D. Gedanenfis, & Reg. Societ. 
Lond. Sodal. ad D. Hans Sloane, M.D . dibla Societatis Secreta- 
rium • varias Obfervationes continent , in Itinere per Italian! fuf- 
cepto , Anno 1703. 
III. Animadver fiones quadam in Co die em MS. membranaceum , fupe • 
riori Epifiola memoratum : Excerpt a ex Addit ament is G. Cfl. 
Schelhammeri ad Herm. Conringi) IntroduFHonem in Artem Me - 
dicam. Cap. XII pag.+Ol. 
IV. A Letter from the late Mr. Edw. Lhwyd, Keeper of the Afhnio- 
lean Mufeunx in Oxford, to Dr. Tancred Robinfon, F. R . S. 
containing feveral Obfervations in Natural Hifiory , made in his 
Travels thro'' Wales. 
V. An Extrabl from a Letter of Mr. Edw. Lhwyd to Dr. Tancred 
Robinfon \ giving fome farther Account of the Birds mentioned in 
the foregoing Letter. 
VI. Some farther Objcrvations relating to the Natural Hifiory of Wales. 
Ina Letter from Mr Edw. Lhwyd to Dr. Tancred Robinfon,F.2?.,S. 
VII. Concerning the proportion of Mathematical Points to each other. 
By the Honourable Francis Robartes Efq\ Vice'Frefident of the 
Royal Society. 
VIII- An Account of an Experiment concerning the Angle requir'd to 
fufpend a Drop of Oyl of Oranges , at certain Stations , between two 
Clefs Planes t placed in the form of a Wedge. By Mr. Fr. Hauks- 
bee, F. R. S. 
IX. A Letter from Mr. Richard Hopton to Mr, John Batchelor \ 
giving an Account of the Eruption of a Burning Spring at Brofeley 
in Shropihire. Communicated by Dr. William Gibbons, Fellow 
of the College of Fhyficians. 
