PLATE 77 



A. — Shade cloth, 6 by 6 mesh. Natural size. 



B. — Shade cloth, 8 by lo mesh. Natural size. 



C. — Shade cloth, 12 by 12 mesh. Nattiral size. 



D. — Shade cloth, 12 by 20 mesh. Natural size. 



E. — Standard cheesecloth used in 1916 experiments. Natural size. 



