< 0 
\* - i 
Feh, 2 2. At 
Night. 
2 3) 2 V 
( 190 ) 
The 1 2th at Night thefe Lights ar6 faid 
tohave appeared again, as aifo on Saturday 
the 1 8th, to a very great degree, but I faw 
them not- the Weather ftill fro fly with 
littleSnow. 
Hard Snow. 
A Thaw and fome Rain, and but little 
Frofl afterwards, only dry cold Winds, till 
the 27th, when the Froft returned very 
(harp, with exceeding cold Winds, atN. E* 
and S. E. for a Fortnight or more, without 
any Snow, and did a great deal of hurt. 
VH. Obfervations on the Mufcular Fibres of Fijh . 
!By Mr. Leeuwenhoeck, F. R. S. 
Delft, April 11. 1721. 
I N my Letter to this Honourable Society of the 
24th of January laft, I treated of the great Num- 
ber of Vellels that I had obferved in the Fibres of 
the Mufcles. I now take the liberty of prefenting 
you with the following Obfervations, hoping there 
may be fomething in them for your Entertainment. 
It has been affirmed to me by feveral Perfons, and 
in particular, by a certain very learned Foreigner, 
that Nature, in all her various Produ&ions, conflantK 
obferves the fame Courfe and Manner of Operatior. 
To this AlTertion my Obfervations do by no means 
agree j neither thofe, that I have made upon the Ge- 
neration 
