[cameron] IODINE IN PLANT AND ANIMAL TISSUES 9 



Green, brown, and red Algae have been examined, and in all 

 species examined iodine has been found, the amounts varying from 

 0-002 to 0-2 per cent. The highest values were obtained with 

 Laminaria, in agreement with the results of other observers. A 

 number of analyses on the different parts of Nereocystis liltkeana 

 (leaves, float, stipe, holdfast) showed marked differences, but in 

 no definite direction, indicating no specific distribution of iodine in 

 the plant. Further analyses will be carried out to test this point 

 further. 



Six specimens of Sponges all gave positive results, the actual 

 figures varying between 0-009 and 0-019 per cent. These are of a 

 lower order than those usually recorded. 



Of the Coelenterata, a hydroid, Obelia longissima, contained 

 0-013 per cent. Negative results (0-000 per cent.) were obtained for 

 jelly-fish, sea-anemones, and comb-jellies. There are no corals 

 obtainable in the Nanaimo district. 



Very interesting results were obtained with Annelid worms. 

 The dry tissue of four species contained amounts of iodine varying 

 from 0-008 to 0-039 per cent, The worm-tubes contained much 

 larger amounts. The calcareous tubes of a Serpulid worm contained 

 0-030 per cent. After removal of the calcium carbonate, analysis 

 indicated that the organic residue contained at least 0-7 per cent. 



A Diopatra worm contained 0-023 per cent. The inner layers 

 of its horny tube • 4 and the outer layers 0-26 per cent. These tissues 

 will be examined further. 



A species of Bryozoa, Bugula flabellata, contained 0-016 per cent. 



The different tissues of sea-urchins showed the presence of traces 

 of iodine. Differentiation was distinctly observable, the test, spines, 

 and hard part of Aristotle's Lantern containing none, and the internal 

 organs amounts of the order 0-05 per cent. Doubtful results were 

 obtained for the sea-cucumber, and negative results for starfishes. 



Crustaceans contain only minute amounts of iodine. 



Pelecypods contain distinct traces. The horse-clam Schizo- 

 thoerus nuttalli was examined in some detail. Most of the tissues gave 

 negative results, but the outer cuticle of the foot was found to contain 

 0-298 per cent. 



The test of the tunicate Pyura haustor was found to contain 

 0-200 per cent. Insufficient material was obtained to carry out 

 accurate analyses of the remaining tissues. 



The tissues of the dog-fish Squalns sucklii were examined in 

 detail Positive results were obtained only with the thyroid (0 • 2 per 

 cent.), kidney (0-003 per cent.) and liver (trace). 



