exposing only to the feel)lest light. To examine the external 

 morphology of an}^ alga, the specimens should he placed in a 

 shallow white dish, and again kept covered over with sea water. 



]{eforo mounting- specimens for the lierharium they 

 should he soaked for a few minutes in fresh spring water 

 to remove as much as possihle of the common salt ])resent. 

 The pliyccerythrin of the Floridese being- soluhle in fresh 

 water, too long an immersion in fresh M'ater would destroy 

 their colour. After heing washed the plant should ])e put 

 between sheets of blotting- paper, or better, some kind of 

 filter paper. I find that so-called common German filter 

 paper answers vevj well indeed. This paper is very much 

 tougher than most kinds of blotting paper, and also a 

 good deal cheaper. A board is put on to the top of the 

 drying paper, and this is weighted down by a few not too 

 heavy stones. In the case of certain algae, which are more 

 delicate than C^/io/idrus crispifs, it will he necessary to fioat 

 them out in fresh water on to a piece of white foolscap 

 paper. They will usually be found to stick naturaUv to 

 the paper they have been mounted on. To prevent their 

 sticking to the filter paper some fine muslin is interposed 

 between them and the drj'ing paper. When the plants 

 have been pressed for a few days, with a daily change of 

 the paper and muslin, the weights may he removed for 

 twelve hours to allow the air to circulate more freely for 

 drying purposes. All the specimens should he carefully 

 labelled with the name, locality, date, and any short 

 remarks which may seem necessary. 



To examine any material unde/ the microscope, it 

 should be cut as fresh as possihle, and examined in sea 

 water. Transverse and longitudinal sections of every "part of 

 the plant should he cut with a razor, with or without 

 clamping the material in pith. The section should then 

 be mounted and examined in sea water. Fresh 



