INTRODUCTION, 15 



found along almost every sandy or pebbly beach, you 

 will be able to get plants which could otherwise be 

 found only by dredging in the deep water. And by 

 careful search, too, among this material, you will find 

 all the deep water forms. 



Second, upon the rocks and in the tide pools 

 when the tide is out. You can collect living plants in 

 their native homes here only. Of course no Algae 

 grow upon the sandy beaches. You must, therefore, 

 seek all such as grow between the tide marks, 

 upon rocky shores. Put on a pair of stout rubber 

 boots, and go two or three hours before low tide 

 and search in every place, following the tide down 

 to its farthest retreat. Many of the best things 

 are found close down by low water mark, and some 

 a little below that. These latter can be got best 

 by taking advantage of the extreme low run of tides 

 which comes about "new" and "full moon." The ad- 

 vantage of going before low tide, and following the 

 retreating waters down, is that you are not so apt 

 to get a drenching by the unexpected advance of a 

 great wave, as when the tide is coming in. For, if 

 you are close by the water's edge when the tide is 

 rising, busily intent upon getting your floral treasures, 

 you will very likely find yourself suddenly soaked 

 with brine, for 



