214 INDEX TO AMERICAN BOTANICAL LITERATURE 
Matz, J. Observaciones ‘hechas en la region cerca de Maricao con 
respecto a las enfermedades del cafe y el guinéo. Revista Agric. 
Puerto Rico 5°: 15-18. 30 N 1920. _ [Illust.] 
Mazza, A. Aggiunte al saggio di algologia oceanica.. Nuova Notar. 
32: 1-48. 1921. 
McAtee, W. L., & Metcalf, F.P. Notes on cockleburs (Ambrosiaceae, 
Xanthium) of the District of Columbia and vicinity. Proc. Biol, 
Soc. Washington 35: 177-179. pl. 4. 30 D 1920. 
McKay, M. B. Blossom-end rot of tomatoes. “Oregon Crop Pest & 
Hort. Rep. 3: 185, 186. 10 Ja 1921. 
McKay, M. B. Mosaic disease of tomato. Oregon Crop Pest & 
Hort. Rep. 3: 179-184. pl. 14 +f. 51,52. 10 Ja 1921. 
McKay, M. B. Western yellow tomato blight. Oregon Crop Pest & 
Hort. Rep. 3: 174-178. f. 50. 10 Ja 1921. 
Melhus, I. E., & Gilman, J. C. Measuring certain variable factors in 
potato seed treatment experiments. Phytopathology 11: 6-17. 
f. 1-5. -Ja ioar. 
Mendiola, N. B. On the evolution of the corn ear. Philipp. Agr. 
ev. 13: 112-114. pl. 19-22. .1920. 
Mestre, A. Las leyes de la herencia y Ja biologia aplicada. Revista 
Fac. Letr. & Cienc. 27: 163-193. f. I-14. 1918. 
Mestre, A. La vida d la “Sociedad Poey” de 1918 a 1919. | Revista 
Fac. Letr. y Cienc. 29: 153-171. 1919. 
Mitra, S. K. Seasonal changes and translocation of car batiytictts 
materials in fruit spurs and two-year-old satencpiacie of apple. Ohio 
Jour. Sci. 21: 89-103. f. 1-7. Ja 1921. 
Mousley, H. The ferns of Hatley, Stanstead County, Quebec, 1920. 
Can. Field-Nat. 34: 137-140. 9 F 192I. 
Munns, E. N. High temperatures and eucalypts. Jour. For. 1 
25-33. ja 1921. 
Murrill, W. A. A new bolete from Porto Rico, Gyroporus Earlei 
sp. nov. Mycologia 13: 60, 61. 3 F 1921 
Murrill, W. A: The fruit- disease survey. Wee x3: 50-53. 
pl. 3. 3 F tot. 
Murrill, W. A. An excursion to Mountain Lake, Virginia. Torreya 
20: 116-119. 5 F 19: 
Nelson, J.C. Crepis setosa in Oregon. 
Rhodora 22: 701, 192. . 13 F. 
1921. 
