PLAXTS — IXSECTICIDAL PROPERTIES. 45 
Xicotiana glauca Graham. Solanaceae. Tree tobacco. South America, in- 
troduced in western United States. 
Sprenger (88) recommends three species (glauca,rustica, and taboy> 
cum) of tobacco as insecticides. 
The writers' results are given on page 23. 
Xicotiana rustica L. Aztec tobacco. Eastern United States. 
Goriainov (29) states that a decoction was an effective stomach 
poison against Malacosoma neustria. 
Xicotiana tabacum L. Common tobacco. South America, now widely culti- 
vated. 
The writers' results are given on page 8. 
Pachyrhizus tuberosus (Lamb.) Spreng. Fabaceae. West Indies. 
Greshoff (31. p. 57), quoting Ernst, says: "The seeds (in decoc- 
tion or in form of powder) are used in Merida (Venezuela) for 
killing vermin." He reports that the tubers and beans contain u 
poisonous resin which is an active fish poison. 
Pangium edule Reinw. Bixaceae. Java. 
The writers' results are given on page 23. 
Petunia sp. Solanaceae. 
Sprenger (88) recommends a decoction of petunia as an in- 
secticide. 
Philadelphia coronarius L. Hydrangeaceae. Sweet mockorange. Europe, 
cultivated in the United States. 
Eiley (71, p. 186) states that an infusion, decoction, and an alco- 
holic extract had no effect on cotton caterpillars. 
Physalodes peruvianum (Mill.) Kuntze. Solanaceae. Synonyms: P. physa- 
lodes Britton. Atropa physalodes L., Nicandra physalodes Pers. Peruvian 
groundcherry. Peru, cultivated and adventive in the United States. 
Pammel (6!±. p. 131) reports it " used as a fly poison in parts of the 
United States.*' 
Phytolacca americana L. Phytolaccaceae. Synonym : P. decandra L. Com- 
mon pokeberry. Ontario and eastern United States. 
Glover (-54, p. 133) reports that the root in either a fresh or dried 
state is poisonous to cockroaches. 
One of Riley's (71, p. 187) assistants reports that a decoction of 
the leaves and berries and an alcoholic extract from the dried roots 
had no effect on cotton caterpillars; but another one of his assistants 
says that a very strong decoction " had a decided effect, killing the 
young worms and seriously affecting the older ones." 
Cook and Hutchison (18, p. If) found that the powdered root had 
no effect on fly larvse. 
Picrasma quassioides (Ham.) Bennett. Simarubaceae. Synonyms: P. ailan- 
tlwidcs Planch., Nima quassioides Ham. Northern India. 
Greshoff (31, p. 30), quoting Batchelor, says that a decoction of 
the bark is used to kill lice. 
Lyons (53, p. 356) says that this species possesses insect icidal 
properties. 
