32 



BACTERIA IN RELATION TO PLANT DISEASES. 



Of the Japanese algce in this group the following, according to Rein (pp. 81-82), 

 deserve special mention : 



(i.) Chniuli'iis piiiiclalus vSiir. 



(2.) Gigarliiia tcnclla Harvey; Jap. Ogo. 



(3.) G. iiitcrincdia Sur. 



(4.) Gh:iiopcl!is tciiax Kg. (Sphacrococcus 

 tciiax .\g. ) 



($.) Gl. cal^illaris Sur.; Jap. Sliiraga-nori. 



(6.) (/"/. colifoniiis Harv. ; Jap. Kek'Kai. 



(7) Gl. intrkaia Sur.; Jap. Fu-nori. 



(8.) Gelidinm corncuin Lamouroux ; Jap. 

 Tokoroten-gusa. 



(9.) G. Auiansii Lamour, 



(10.) G. cartilagiiwinii O-ail. 



(ji.) G. rigiduin Grev. ; Jap. Tosaka-nori, /. c, 

 cxickscotiTb alg.T. 



(12.) Spliacrococcus coiifcn'oidcs A.; Jap. 

 S'liiranio. 



(13.) Gyiniiogoiignis fiabclUftirmis Harv.; 

 Ja'p. ] lome-nori. 



(14.) G. japonictis, Sur.; Jap. T.suno-inata. 



(15.) Kallyiiicnia dcntafa: Jap. To.-iaka-nori. 



(l6.) Porpliyra znilgaris Ag. ; Jap. Asakusa- 

 nnri. 



Fig. 30.* 



Agar-agar is a nentral or nearly neutral substance which is converted b}- boil- 

 ing with water into a stiff j'elly that hardens in i per cent solution at 39° to 40° C., 

 and is not easily liquefied either by the growth of organisnisf 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 anah'sis 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. 



*FiG. 30. — Another form of agar-agar known to tlie Japanese as square " Kaiiten." T'lie 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 loj^ by 2' 2 by I'J inches. 



tMetcalf has described a bacillus which slowly softens it, and die writer has observed similar 

 phenomena. 



