( ^7]0 ) 
&s on the contrary, Fifhcs living always in Water want 
no Eye-lids, becaufe the fame Water keeps their Eyes 
#ver moift and clean 3 with which anfwer the Gen- 
tleman was fatisfy'd. But I have fincc found that I was 
out in my afTertion, for Flounders, Plaife, Soles, and I 
believe all flat Fiflies can cover their Eyes 5 and if they 
had not, I fancy they would lofe their Sight, becaufe the 
faid fort of Fifli are net fo nimble as others in Swimming, 
being only able to move their Tails, the chief Inftru- 
ments of Speed, upwards and downwards 3 wherefore 
thefe Fifhes in a Storm don't betake themfelves to the 
bottom of the Sea, as I am informed, but dig themfelves 
holes in the Sand, which fecures them from being caft 
upon the Beach or Strand : Now if they had not Eye- 
lids, the ("harp points 6t Sand, whilft they are making 
their Ntfr, v^ould wound the Tunicks of their Eyes, 
whereby the Tranfparency thereof would be deftroy'd, 
and the Fi(hes become blind 5 which is a farther proof 
how perfciS every Creatare is in its own Species. I con- 
clude, &c. 
IV. J Letter fm?t Mr Antony van Leeuwenhoek, 
concerning the Tubes or Canals that conpey the yellow 
Sap in the Herb catUd Chelidonium maju^, er 
Xelandine^ Sec. 
t)elft in Holland^ September 16, 1704, 
THe Heer Peter Botton^ ProfefTor in Phyfick and Bota- 
ny aiLeyde^^ and Fellow of the Royal Society,made 
me a Vifit«totely, and difcourfing of feveral things, hede- 
fir'd me, that I would examin the Chelidonium mdjus^ to 
wit, whether the Canals or Tnbes that bring up the yel- 
low Sap were diftinguifht or feparatedfroni other Tulips ^ 
1 
