208 PHARMACOGNOSY [Bot. Absts... Vol. IV, 



this fact is attributed to the wetter, natter, more poorly drained conditions of bottom sites. 

 Since the earliest age class of trees infected on bottom sites was found to be 71 to 80 years 

 and that on slope sites 61 to 70 years, it is concluded that the earliest age of infection may be 

 safely placed at 50 years. This age of infection is associated with the formation of heartwood 

 and the appearance of injuries susceptible to infection. The period leading up to the earliest 

 age of infection is defined as the one during which greatest precaution should be used in pro- 

 tection from spore infection. Injuries due to broken tops, branch stubs, frost cracks, fire 

 scars, etc. appeared to increase quite consistently with each increase in age class of trees, 

 thus largely accounting for the corresponding increase in rot infection with age. Site was 

 found not to appreciably affect the vitality of sporophores but to have some influence on the 

 number produced. With the higher percentage of rot infection on bottom sites was associated 

 a larger number of sporophores over that found on slope sites. The maximum of sporophore 

 production occurred in the age class of 121 to 160 years. The 101 to 120 age class would, 

 therefore, from the pathological point of view be the proper age class for felling. Felling 

 before the period of maximum sporophore production would appear to be one of the best means 

 of controlling rot infection. Strict observance of pathological marking rules and the removal 

 of infected slash are also recommended as control measures. — E. V. Flardenburg. 



1380. Wolf, F. A., and E. G. Moss. Diseases of flue cured tobacco. Bull. North Caro- 

 lina Dept. Agric. 40 12 : 5^45. 24 fig. 1919. — This popular, illustrated account concerns the 

 appearance, cause, hosts and control of some of the diseases affecting the growing crop. Con- 

 sideration is given to wilt, root knot, root rot, sore shank, mosaic, frenching, wildfire, angular 

 leaf spot, common leaf spot, frogeye, and crookneck. — F. A. Wolf. 



1381. Yamamoto, R. On the insecticidal principle of Chrysanthemum cinerariifolium. 

 Ber. Ohara Inst. Landw. Forsch. 1 : 389-398. 1918.^3ee Bot. Absts. 4, Entry 2693. 



1382. Young, H. C. Seed disinfection for pure culture work. Ann. Missouri Bot. Gard. 

 6: 147-158. 1919.— See Bot. Absts. 4, Entry 1615. 



PHARMACEUTICAL BOTANY AND PHARMACOGNOSY 



Hebek W. Youngken, Editor 



1383. Anonymous. Animal and vegetable rennets. Their properties, their preparation, 

 and their mode of action. [Translated from F. Faideau, in LaRousse Mensuel (Paris)]. Sci. 

 Amer. Supplem. 87:285. S fig. 1919. — Plants rich in rennet include the wild artichoke 

 (Cynaria cardunculus) , yellow cheese-rennet (Galium verum), commoD fig, butterwort (Pingui- 

 cula vulgaris), papaw (Carica papaya), (Witania coagulans) of India, paper mulberry (Brous- 

 sonetia papyrifera) , darnil, lucerne, lupine, euphorbia, madder, etc. — Chas. H. Otis. 



1384. Anonymous. Surgical sphagnum in eastern Maine. Sci. Amer. 121: 5. 1919. 



1385. Anonymous. The castor bean and its many uses. Sci. Amer. 120: 528, 530. 1919. 



1386. Arnold, Julson. Chinese products of interest to nurserymen. Nation. Nursery- 

 man 27: 20-21. 1919.— See Bot. Absts. 4, Entry 895. 



13S7. Hoepner, Karl. Beitrag zum Nachweis eines unzulassigen Schalengehaltes in 

 Kakaoerzeugnissen. [Inadmissible shell content in cacao products.] Zcitschr. Untersuch. 

 Nahrungs-u. Genussmittel. 37: 18-31. 1919. — Report of examination for impurities of cacao 

 powder from various sources. A shell content of cacao products is inadmissible according to 

 German official standards if (1) the microscopic examination shows a considerable number of 

 cellular elements of shells, (2) the fat-free and sugar-free dry residue contains an ash-free 

 crude fiber content of more than 6 per cent, (3) the fat -free and sugar-free dry substance con- 



