148 MISSOURI BOTANICAL GARDEN. 



474. von Schrenk, H. and G. G. Hedgcock. Crown-gall 

 and hairy-root diseases of the apple tree. Ann. Rept. 

 Mo. Hort. Soc. 49 : 252-253. 1906. 



475. The wrapping of apple grafts and its relation to 



the crown-gall disease. U. S. Dept. Agr., Bur. PI. Ind. 

 Bull. 100 : 13-20. 1907. 



476. von Schrenk» H., E. B. Fulks and A. L. Kammerer. 

 Changes which take place in coal-tar creosote during 

 exposure. Bull. Amer. Railway Engineering and Main- 

 tenance of Way Assoc. 93 : 1-27. 1907. 



477. Spaulding, P. A biographical history of botany at 

 St. Louis, Missouri. Pop. Sci. Monthly. 73 : 488-499. 

 /. 1-2. 1908; 74 : 48-57, 124-133, 240-258. /. 3-19. 

 1909. 



478. A blight disease of young conifers. Science, n, s. 



26 : 220. 1907. 



479. A disease of black oaks caused by Polyporus ob- 



tusus Berk. Rept. Mo. Bot. Gard. 16 : 109-116. pL 

 13-19. 1905. 



480. Heart rot of Sassafras sassafras caused by Fomes 



ribis. Science, n. s. 26 : 479. 1907. 



481. Studies on the lignin and cellulose of wood. Rept. 



Mo. Bot. Gard. 17 : 41-58. 'pl 1-2. 1906. 



482. Two fungi growing in .holes made by wood-boring 



insects. Rept. Mo. Bot. Gard. 15 : 73-77. pl. 25-27. 

 1904. 



483. [Mycological abstracts]. Botanisches Centralblatt. 



1904-1907. 



Spauidin^r, P. — See Hedgcock, G. G. and P. Spaulding. 



484. Thompson, C. H. Agaves at Missouri Botanical Gar- 

 den. Florists' Exchange. 18 : 262. 2 ff. 1904. 



485. Cacti at Missouri Botanical Garden. Florists' 



Exchange. 18 : 16. 2 ff. 1904. 



486. Succulent plants. Amer. Florist. 30 : 384-385. 



ff. 1908. 



487. Trelease, W. Aberrant veil remnants in some edible 

 agarics. Rep. Mo. Bot. Gard. 15 : 83-85. j)l. 30-39. 1904. 



488. Additions to the genus Yucca. Rept. Mo. Bot. 



Gard. 18 : 225-230. pl. 12-17. 1907. 



