30 abstracts: phytopathology 



by 120 to 192 ix. The spores, both on the nost and in cultures, are large, 

 colorless or yellowish, oblong or ovoid, rounded at both ends, or subacute, 

 .measuring 16 to 32 by 6 to 12 /x, being either long and slender (32 by 8 n), 

 or broad and short (16 by 8 /x), with intergradings. Some time after the 

 appearance of the pycnidia small, cylindrical, colorless, 1-celled, spore- 

 like bodies, the so-called spermatia, are found both in cultures and on the 

 host. Their germination has not been observed. Chlamydospores 

 have never been observed on the host, but in old cultures on steamed 

 vegetables or fruit, large, thick-walled, intercalary, brown, spore-like 

 bodies are sometimes present in abundance. 



Pruning is recommended as a remedy for the disease, and care should 

 be taken to remove the affected limbs well below the lowest knot as the 

 mycelium has been found in the stem 1^ ft. beyond any external indica- 

 tion of its presence. Badly diseased trees should be rooted out and 

 burned to prevent dissemination of the fungous spores. 



Erwin F. Smith. 



REFERENCES 



MET AhhOGRAFRY. —Metallography and metallurgy at the Bureau of Standards. 

 George K. Burgess. Metallurgical and Chemical Engineering 10: 467. 

 1912. 



RADIOTELEGRAPHY.— r/ie work of the U. S. Naval Radiotelegraphic Labo- 

 ratory. L. W. Austin. Journal American Society Naval Engineers 24: 122. 

 1912. 



PHYSICS.— Melting points of the chemical elements. Bureau of Standards Cir- 

 cular 35. 



