A Study of Susceptibility in Some Puget Sound Algae 



C. M. Child 

 University of Chicago 



In the course of the summers of 1917 and 1918, spent at the Puget 

 Sound Biological Station, the axial susceptibility relations of a number 

 of the Puget Sound algae were examined as opportunity offered, thus 

 extending the work done earlier at Woods Hole (Child, 1916a, 1916c, 

 1917a, 1917b). The observations were mostly made on common species 

 which were readily obtainable in fresh condition, and there was no attempt 

 to obtain a full representation of the algal flora of the region. I am 

 deeply indebted to the Director of the Station for the facilities afforded 

 for this and other work, and also to Miss A. M. Hurd for the identifica- 

 tion of most of the species examined, which include the following forms : 



Chlorophyceae 



Cladophora sp. 



Phaeophyceae 



Desmarestia aculeata 

 Nereocystis luetkeana 



Rhodophyceae 



Callophyllis variegata 

 Callymenia phyllophora 

 Agardhiella tenera 

 Euthora fruticulosa 

 Fauchea lacininta 

 Nitophyllum ruprechtianum 

 Bonnemaisonia hamifera 



Desmarestia ligulata 



Odonthalia lyallii 

 Polysiphonia californica 

 Polysiphonia urceolata 

 Dasyopsis plumosa 

 Callithamnion sp. 

 Ptilota pectinata 

 Ceramium sp. 



Some observations were also made upon a diatomaceous pseudo- 

 thallus of the Navicula group. 



METHODS 



The agents chiefly used in determining the susceptibility relations 

 were KNC m/500 — m/100, HCl m/500 — m/100, ethyl alcohol 5^/, and 

 in certain cases higher concentrations, the 'vital' dye neutral red, either 

 alone or followed by some other agent, e.g., KNC. In a few special cases 

 KOH or NaOH m/100 was used, the penetration and action of methylene 



(21.9) 



