18 METHOD OF DESTROYING ALG^ IN WATER SUPPLIES. 



Effect of various concentraiions of copper sulphate upon <Vfferent forim ofal'j;. 

 [cl=dead; vfa=very few alivo: vfd=very few dead; g=iii good couditiou.] 



&ROXJP 1. 

 CHLAMYDOMONAS PIRIFORMIS Dill. 



Date. 



Date. 



Date. 



December 2-5 

 January 4-7 . . 



Date. 



One part copper sulphate to water, parts — 



i 2,000 



October 19-21 

 October 21-24 

 October 24-27 



id 

 id 



5, 000 



g 



vfd 

 vfd 



10,000 



g 

 g 



20,000 



g 

 g 



200,000 



g 

 g 

 g 



1,000,000 



g 

 g 

 g 



Check. 



g 

 g 

 g 



RAPHIDIUM POLYMORPHUM Fres. 



October 19-29. . . 

 November 2-6 . . 

 November 16-20 



One part copper sulphate to water, parts — 



25, 000 



d 

 d 

 (1 



50,000 



d 

 id 



vfa 



75,000 



id 

 id 



id 



100, 000 



Ad 

 Ad 

 vfd 



500, 000 



g 

 g 

 g 



1,000,000 



g 

 g 

 g 



Check. 



g 

 g 

 g 



DESMIDIUM SWARTZII Ag. 



One part copper sulphate to water, parts- 



50,000 



d 

 d 



75,000 



d 

 d 



100, 000 



id 

 Jd 



150, 000 



vfd 

 vfd 



200,000 



g 

 g 



1,000,000 



Check. 



g 

 g 



g 

 g 



STIGEOCLONIUM TENUE (Ag.) Rabenh. 



December 21-24 

 January 2-5 . . . 

 January 7-11 . . 



One part copper sulphate to water, parts — 



50,000 



id 

 id 

 id 



100, 000 



id 

 id 

 id 



300, 000 



id 

 id 

 id 



500, 000 



id 

 id 

 id 



1,000,000 



vfd 

 vfd 

 vfd 



2, 000, 000 



g 

 g 

 g 



Check. 



g 

 g 

 g 



DRAPARNALDIA GLOMERATA (Vauch.) Ag. 



NAVICULA Sp. 



