152 POPULAR LECTURES AND ADDRESSES. 



the water would rise in the night higher than usual, 

 and nothing was done to make his transports 

 secure higher up on the shore while he was 

 fighting the Britons. After the accident Csesar 

 was no doubt told " Oh, we knew that before, 

 but it might have been ill taken if we had 

 said so." 



Strabo says "Soon after moonrise the sea 

 begins to swell up and flow over the earth till the 

 moon reaches mid heaven. As she descends thence 

 the sea recedes till about moonset, when the water 

 is lowest. It then rises again as the moon, below 

 the horizon, sinks to mid heaven under the earth." 

 It is interesting here to find the tides described 

 simply with reference to the moon. But there is 

 something more in this ancient account of Strabo ; 

 he says, quoting Posidonius " This is the daily 

 circuit of the sea. Moreover, there is a regular 

 monthly course, according to which the greatest 

 rise and fall takes place about new moon, then 

 diminishing rise and fall till half moon, and again 

 increasing till full moon." And lastly he refers to 

 a hearsay report of the Gaditani (Cadizians) regard- 



