( 5*9 ) 
was removed in fiich a manner by the Thunder and 
Lightning, that all People did admire it ftood, and not' 
fall upon the Houfe. And tho’ the People ran up and 
down in a great Confternation at the dreadful Thunder 
and Lightning, yet no body was hurt. 
This Relation comes from the Minider who then 
officiated. 
Vi. Some Siicrofcopical Obfervations upon Mufcles, 
and the manner of their 'Production, In a Letter 
from A dir, Anthony van Leeuwenhoek, F.R.S. 
Delft , June the 10th 1712. N. 3 * 
I Have obferv’d a great many Years ago, that the 
Shell Fifh call’d Mufcles, lay their Eggs upon the 
ouilide of their Shells 5 and that fo regularly one by an 
other, that they may be compared to a String or Band. 
Thefe Eggs, or imperfeft Mnicles lying upon the Shells, 
do continually increafe in Strength, till at lad they come 
to be perfect Mufcles $ but then you may fee remaining 
upon th*e Shells a part of the Egg-lhell, which dicks fad 
to the faid Shell, till the Skin or Membrane, wherewith 
the Mufcles are encompalfed, is changed. 
In the Month of Anguft 17 10. I procured fome Muf- 
cles, and difkdted them according to the bed of my 
Power $ and found within the Shells on both (ides of the 
Mufcle, againd the Parts of the Fifh, very thin and weak 
Membranes 5 which I have taken often out of the Muf- 
cles, and placing them before a Microfcope I have feen 
fuch a vaft Number of Motions in the faid Membranes^ 
that it is not to be deferibed either by Pen or Words, 
and 1 fhow’d the fame like wife to other Perfons: And 
C c c c I 
