-11- 
POLYTRICRACEAE 
(Mosses) 
POLYTRICHDM JTJNIPERINUM Wllld. Hairoap moss. 
Extracts were not repellent to the Japanese beetle.— Metzger and 
Grant (277). 
RHODOPHYCEAE 
(Red Algae) 
CHONDRUS CRISPUS (L.) Staok. Carrageen. Irish moss. 
In Germany it was believed that seaweed mucilage might control 
insects in orchards and vineyards. The mucilage was prepared by boil- 
ing 4 pounds of Irish moss in 20 gallons of water for 1 hour. When 
the mucilage was sprayed on infested plants, pieces flaked off taking 
with them the eggs and larvae of the injurious insects. Still more 
effeotive results were obtained by adding 2 pounds of ethereal oil of 
mustard, dissolved in 10 pounds of methylated spirit, to every 2,000 
to 4,000 pounds of mucilage.— Issleib (215 ) • 
Alginio acid is derived from a seaweed, probably from Chondrus 
or other alga* Woolen fabrics are impregnated with a soluble salt 
of alginio aoid and then plaoed in a bath of antimony salt (Ger. 
patent 304,506) •-- Ro ark (535 , p. 7). 
This boss was a constituent of a petrolatum emulsion used for 
mothproofing fabrios (U. S. patent 1,799,047) .— Roark (335 , p. 24). 
SALVINIACEAE 
(Fernlike Plants) 
AZOLLA CAROLINIANA Willd. 
This small floating plant grows densely in stagnant water and 
oovers the surface for large areas so that mosquito larvae are unable 
to reach the surface to breathe. It is recommended in Austria as a 
good plant to raise in stagnant waters to prevent the development of 
mosquitoes.— Henkel ( 192 ). 
AZOLLA sp. 
Asolla and Lemna , when grown in water where mosquitoes breed, 
oheok the breeding by preventing the larvae from getting air. — Howard 
(203, pp. 25, 27). 
