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nN 
BACTERIA IN RELATION TO PLANT DISEASES. 
Of the Japanese algze in this group the following, according to Rein (pp. 81-82), 
deserve special mention: 
(1.) Chondrus punctatus Sur. (10.) G. cartilagineum Gail. 
(2.) Gigartina tenella Harvey; Jap. Ogo. (11.) G. rigidum Grev.; Jap. Tosaka-nori, i. e., 
(3.) G. intermedia Sur. cockscomb alge. 
(4.) Gloiopeltis tenax Kg. (Sphaerococcus (12.) Sphaerococcus confervoides A.; Jap. 
tenax Ag.) Shiramo. 
(5.) Gl. capillaris Sur.; Jap. Shiraga-nori. (13.) Gymnogongrus flabelliformis Harv.; 
(6.) Gl. coliformis Harv.; Jap. Kek’Kai. Jap. Home-nori. 
(7) Gl. intricata Sur.; Jap. Fu-nori. (14.) G. japonicus, Sur.; Jap. Tsuno-mata. 
(8.) Gelidium corneum Lamouroux; Jap. (15.) Kallymenia dentata; Jap. Tosaka-nori. 
Tokoroten-gusa. (16.) Porphyra vulgaris Ag.; Jap. Asakusa- 
(9.) G. Amansii Lamour, nori. 
Fig. 30.* 
Agar-agar is a neutral or nearly neutral substance which is converted by boil- 
ing with water into a stiff jelly that hardens in 1 per cent solution at 39° to 40° C., 
and is not easily liquefied either by the growth of organismst or by heat less than 
that of boiling water. It is a kind of vegetable glue forming a good matrix for 
various nutrient substances. A chemical analysis by Karten (Descript. Cat. Int. 
Health, Exhib., London, 1884) gave the following proximate composition : 11.71 per, 
cent nitrogenous matter (albumen [?]), 62.05 per cent non-nitrogenous matter (evi- 
dently glue, the pararabin of Reichardt), 3.44 per cent ashes, and 22.80 per cent water. 
*Fic. 30.—Another form of agar-agar known to the Japanese as square “ Kanten.” ‘The bulk of 
this goes to Holland, where it is used for clarifying schnapps. Courtesy of Dr. Hugh M. Smith. 
The actual size of these sticks is about 10% by 2% by 1% inches. 
tMetcalf has described a bacillus which slowly softens it, and the writer has observed similar 
phenomena. 
