VOL. II.] , PHILOSOPHICAL TRANSACTIONS. 227 



bly, by collecting the warmed air in the day-time, which it would not do after 

 sun-set. 



Tides observed at Plymouth. By Mr. S. Colepresse. iV** 33, p. 632. 



The diurnal tides, from about the latter end of March till the latter end of 

 September, are about a foot higher in the evening than in the morning, that 

 is, in every tide that happens after noon and before midnight. On the con- 

 trary, the morning tides, from Michaelmas till Lady-day in March again, are 

 constantly higher by about a foot than those that happen in the evening. And 

 this proportion holds in both, in the intermediate times of increase and decrease. 

 The highest monthly spring tide is always the third tide after the new or full 

 moon, if a cross wind do not oppose the water, as the north-east or north-west 

 usually does. The highest springs make the lowest ebbs. The water neither 

 flows nor ebbs alike in respect of equal degrees; but its velocity increases with 

 the tide, till just at mid-water or half flood, at which time the velocity is 

 strongest, and so decreases proportionably till high water or full sea. As ap- 

 pears by the following scheme, collected from observations made at several 

 times and places ; which, though taken at Plymouth Haven, where even the 

 water usually rises about sixteen feet, yet it may indifferently serve for otlier 

 places, where it may rise as many fathoms, or not so high, by a proportional 

 addition or subtraction. 



I 



flhr.l feet 



I 2 2 



Time of j 3 4 



Flowing j 4 4 



I 5 2 



16 I 



Inquiries and Directions for the Antilles^ or Caribhee Islands. 



N° 33, p. 634. 



/. Of Fegetahles. 



1 . Whether the juice of the fruit of the tree junipa, being as clear as any 

 rock water, yields a brown violet dye, and being put twice upon the same place 

 makes it look black ? and whether this tincture cannot be got out with any 

 soap, yet disappears of itself in nine or ten days : and whether certain animals, 

 and particularly hogs and parrots, eating of this fruit, have their flesh and fat 

 altogether tinged of a violet colour ? — 2. Whether ring doves that feed upon 



p p 2 



