130 



W. J. ROBBINS. 



Sea water yellow with sperm was placed in two vials. One 

 vial was placed in an ice- water bath at approximately 4 C. and 

 the other was left at room temperature of 25-27 C. Portions 

 were removed from time to time and examined for activity. 



Begun at n:oo A.M. 



SUMMARY. 



Using the Pfeffer capillary tube method of determining 

 chemotaxy, it was found that certain acids cause collection of 

 Fucns spermatozoids. It is suggested that this may be explained 

 as due to toxicity and not chemotaxy. Fucns spermatozoids are 

 negatively phototactic. Low temperature is favorable to the 

 activity of Fucus spermatozoids. 



LITERATURE CITED. 



1. Strasburger, E. 



'84 Das Botanische Practicum, Erste Auflage. P. 392. 



2. Bordet, Jules. 



'94 Contribution a 1'etude de 1'irritabilite des spermatozoides chez les 

 Fucacees. Bull, de 1'Acad. Roy. de Belgique, 3 serie 27: 888-896. 



3. Kusano, S. 



'09 Studies on the Chemotactic and other Related Reactions of the 

 Swarm spores of Myxomycetes. Tokyo Imp. Univ., Agr. Jour. 2: 1-83. 



4. Engelman, T. W. 



'82 Uber lichtund Farben perception niederster Organismen. Arch. f. d. 

 ges. Physiol. 29: 396. 



