916 
Journal of Agricultural Research 
Vol. XXXI, No. ie 
(15) Sappin-Trouffy, P. 
1896-97. REGHERCHES HISTOLOGIQTJES SUR LA FAMILLE DES UR^DINEES. 
Botaniste 5: 59-244, illus. 
(16) Spaulding, P. 
1922. VIABILITY OF TELIA OF CRONARTIUM RIBICOLA IN EARLY WINTBR. 
Phytopathology 12: 221-224. 
(17) - 
1922. INVESTIGATIONS OF THE WHITE-PINE BLISTER RUST. U. S. Dept. 
Agr. Bui. 957, 100 p., illus. 
(18) -and Gravatt, A. Rathbun. 
1925. CONDITIONS antecedent to the infection of white pines by 
CRONARTIUM RIBICOLA IN THE NORTHEASTERN UNITED STATES. 
Phytopathology 15: 573-583, illus. 
(19) Taylor, M. W. 
1922. POTENTIAL SPORIDIA PRODUCTION PER UNIT IN CRONARTIUM RIBI¬ 
COLA. Phytopathology 12: 298-300, illus. 
(20) Tulasne, L.-R. 
1854. SECOND M^MOIRE SUR LES UR^DINEES ET LES USTILAGIN&ES. Ann. 
. Sci. Nat., Bot. (IV) 2: 77-196, illus. 
(21) Ward, H. M. 
1905. RECENT RESEARCHES ON THE PARASITISM OF FUNGI. Ann. Bot. 
19: 1-54. 
(22) York, H. H., and Snell, W. H. 
1922. EXPERIMENTS IN THE INFECTION OF PINUS STROBUS WITH CRO¬ 
NARTIUM ribicola. (a preliminary statement.) Phyto¬ 
pathology 12: 148-150. 
