- 505 - 
their cohesion is less than their adhesion.- Aqueous solutions such as 
nicotine do not. penetrate the tracheae at all except in the form of 
vapor. When nicotine sulphate comes in contact with the oody of an 
insect it is slowly decomposed with the formation of nicotine which 
enters as a vapor. 
PAREENT JEV, T. A. (2145) 
1918. Oh THE METHODS OP DESTRUCTION 0? MOSQUITOES. Jour. Econ. int. 18 
(6): 839-840, illus. 
A series of tests on the use of tobacco smoke for destroying 
hibernating mosquitoes in Russia was conducted by burning tobacco 
powder (30 - 40 g, to 1 cubic meter). The powder was mixed with 
. chopped hay and left to smolder in the room on iron sheets. The 
fumigation lasted 16 hours and usually all the mosquitoes were killed, 
mosquitoes, confined in bell-glasses, -./ere also fumigated by 
using nicotine solutions. A time curve is used to show the results. 
As to the symptoms of nicotine poisoning, the abdomens of some 
of the mosquitoes were abnormally extended; the same was true in the 
nicotinized cockroach ( Stylopyga oriental is Lin.). The anterior in- 
testine was also swollen. 
REGAN, ./. S. (2146) 
1918. LATE DORMANT VERSUS DELAYED DORMANT OR GREEN TIP TREATMENT EOR THE 
CONTROL Oi APPLE APKIDS. Mass. Agr. Expt. Sta. , Bull. 184, pp. 
47-57. [Abstract in Rev. Appl. Ent. (A) 7: 460-461. 1919.] 
The application ot lime-sulphur (1:6) and nicotine sulphate 
(l;800) combination applied at the delayed dormant period gives 
practically a perfect control for apple aphids. The action of nico- 
tine sulphate is slow, and death appears to oe due to paralysis. 
BCHELLHASE (2147) 
1921. UEBER DIE MIBKUMG VON ALKALOIDEN AUP I1ISEKTEN (HIPPOBOSCIDEN) . 
T i in Tierarztl. Uchnschr. 37: 325-329. 
Tests made with a decoction of discarded cigarette-stubs 
in concentrations of 1 to 100 and 1 to 1000 resulted in a prompt para- 
lyzation of the flies and subsequent death, weaker concentrations 
(1:5000 - 1:100,000) produced cramps and violent action of the 
wings, which may be so strong that decapitated flies were aole to 
fly away* Still weaker solutions (1:300,000 - 1 : 900,000) produced 
cramps, and rapid motion of the wings and of the legs. 
CROZIER, if. J. (2148) 
1922. liRciVERSAL OE INHIBITION" BY ATROPINE, IN CATERPILLARS. Biol. 
Bull. 43 (4): 239-245. 
