L62 



BULLETIN OF THE BUREAU OF FISHERIES. 



are "kajime" UZcklonia cava), "arame" (Scklonia bicyclis), and "ginbaso" (Sorgos- 

 xiim). The following table, based on the analyses of the Imperial Fisheries Bureau, 

 shows the proportion of iodine in different algse. It will be seen that the percentage 

 of iodine in Sargas&wm is very small, while kelp {Laminaria) contains by far the 

 largest, percentage in a given quantity of ash and EcMonia the largest percentage in 

 the fresh weed. 



Analyses of seaweeds from which iodine is extracted. 



The iodine salts are not uniformly distributed in the different parts of the 

 plants, and moreover vary in quantity from month to month. These points are 

 brought out in detail in the following interesting series of analyses of " kajime" 

 {EcMonia cava) from the Chiba coast, made by the Imperial Fisheries Bureau: 



Analysis of EcMonia cava. 



The seaweeds are gathered chiefly in summer, some from the shores where they 

 have been washed, some from submerged rocks and small stones by means of a 

 knife attached at right angles to a bamboo pole. It is reported that the supply of 

 alga' most valuable for iodine manufacture is diminishing. 



TREATMENT OF THE ALU.K. 



The weeds are dried on the shores in the sun, then heaped and burned. The t'sh 

 is collected and either sold to the manufacturers or treated by the fishermen them- 

 selves. Following is an outline of the reducing process: 



