F. H. Stewart 
179 
High atmospheric humidity assists the migration of the worms, previous 
disease or injury of the host plant may do so. Some races of various species 
of plants are immune. 
Treatment of the affected plants by chemical methods is of limited applic¬ 
ability. Treatment by immersion in water at 50-52° C. for five minutes is recom¬ 
mended by Marcinowski (1908). Prophylaxis should be based on burning of 
infected plants and leaves, and on the avoidance of infected surface soil in the 
filling of pots and boxes. 
REFERENCES. 
Atkinson (1890). Nematode Leaf Disease. Insect Life, iv. 31. 
Cattie, Theodor (1901). Kleiner Beitrag zur Kenntnis der Alchenkrankheit der harn- 
krauter. Zeitschr. f. Pfianzenkrankh. XI. 34. 
Chifflot (1902). Sur l’origine de certaines maladies des Chrysanthemes. C.R. Acad. Sci. 
Paris, cxxxiv. 196. 
Cobb, N. A. (1891). Strawberry bunch. Agric. Gaz. N. S. Wales, n. 390. 
- (1915). Tylenchus similis in Sugar Cane and Bananas. Journ. Agric. Res. iv. 561. 
Hofer, J. (1901). Nematodenkrankheit bei Topfpfianzen. Zeitschr. f. Pfianzenkrankh. xi. 34. 
Jagerskiold, L. A. (1901). Weitere Beitrage zur Kenntniss der Nematoden. K. Svensk- 
Vetensk. Akad. Handl. xxxv. 
Klebahn, H.*(1891). Zwei vermutlich durch Nematoden erzeugte Pflanzenkrankheiten. 
Zeitschr. f. Pfianzenkrankh. i. 321. 
Looss, A. (1911). The anatomy and life history of Agchylostoma duodenale Dub. It II. 
Rec. School of Med. Cairo. 
Man, J. G. de (1884). Nematoden der N iederlandischen Fauna. 
Mangin, L. (1895). La Maladie de la Rouille. C.R. Soc. Biol. ser. 10, II. 749. 
Marcinowski, K. (1908). Zur Kenntnis von Aph. Ormerodis R.B. Arb. der Kais. Anst. f. 
Land u. Forstw. Berlin, vi. 407. 
- (1910). Ibid. vn. 1. 
Molz, E. (1909). Aph. olesistus und Alchenkrankheit der Chrysanthemum. Centr. Bald. u. 
Parasit. Orig. 2 Abt. xxm. 656. 
Osterwalder, A. (1901). Nematoden als Feinde des Gartenbaues. Gartenflora, l. 33/. 
- (1902). Nematoden an Freilandpflanzen. Zeitschr. f. Pfianzenkrankh. xn. 338. 
- (1904). Ibid. xv. 43. 
Ritzema Bos (1891). L’Anguillule de la Tige. Tylenchus devastatrix Kuhn. Arch, du Musee 
Teyler. 
Schneider, A. (1866). Monographic der Nematoden. 
Sorauer, P. (1901). Die Alchenkrankheit bei Chrysanth. indicium. Gartenflora , L. 35. 
_ (1902). Zur Wurmkrankheit der Begonien. Zeitschr. J. Pfianzenkrankh. xii. 183. 
Smith, Worthington (1890). Gardeners' Chronicle, n. 298. 
Stewart, F. H. (1906). Anatomy of Oncholaimus vulgaris Bast. Quart. Journ. Micr. Sci. 
l. 101. 
- (1921). Life history of Ascaris lumbricoides L. Parasitology, xni. 37. 
REFERENCE LETTERS. 
A, anus; AF, Aphelenchus fragariae; AP, A. phyUophagus ; CA, anterior section of oeso¬ 
phageal collar; CN, collar nucleus; CP, posterior limit of collar; D, dorsal surface; K, excretory 
pore; GC, guard cell of stoma; II, hair; I, intestine; IL, intestinal lumen; LL, lateral line; N, nerve 
ring; O, ovarv; OA, anterior oesophagus; OB, oesophageal bulb; Oh, endothelium of gonad tube, 
OG, oesophageal gland; 01, junction of oesophagus and intestine: OP, posterior oesophagus; 
OV, ovum; P, papilla; R, renette cell; RE, rectum; S, spear; SCY , spermatocyte; SB, salivary 
duct; SG, salivary gland; SGO, spermatogonium; SO, opening of salivary duct into bulb; SP, 
spicule; SPH, sphincter; ST, spermatid; STO, aperture of stoma; SZ, spermatozoon ; U, uterus; 
V, vulva; VB, vaseular bundle; VA, anterior vagina ; VP, posterior vagina; 1 X, ventral surface. 
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