334 EDWARD C. DAY 



14. Duration of contraction increases with increase in the 

 strength of stimulation (Kinoshita, '10). 



15. The aboral siphon is the most sensitive, judged by the 

 shortness of the latent period; but judged by the duration of 

 contraction, the oral is the most sensitive (Polimanti, '10). 



16. Successive stimulations cause both a decrease in vigor and 

 duration of contractions (Kinoshita, '10). 



17. Contraction of the siphon begins at the tip and travels 

 downward, while relaxation begins at the base and travels 

 upward (Po'imanti, '10). 



18. There are four types of reflexes: 1) the individual, involv- 

 ing only the local region stimulated; 2) the protective, in which 

 the impulse travels swiftly from siphon to siphon via the gan- 

 glion; 3) the general, which spreads more slowly from siphon to 

 siphon via the base of the animal; 4) the ejection reflex (Jordan, 

 '08). 



19. Narcotizing reagents are: cocain, magnesium sulphate, 

 chloral hydrate, aceto-chloroform, quinine sulphate, nicotine, 

 hydrochloride (Kinoshita, '10), and morphine in weak doses 

 (Polimanti, '10). 



20. Excitative reagents are: Strychnine, and morphine in 

 strong doses (Polimanti, '10). 



21. Curare is a partial narcotic according to Kinoshita ('10), 

 but an excitant according to Polimanti ('10). 



22. As to the effect of temperature: 30°C. causes frequent 

 opening and closing of siphons; 32° begins to have a benumbing 

 effect, and 35° causes animal to shrink and become unresponsive 

 (Polimanti, '10). 



23. For the effect of light only negative results were obtained 

 by Kinoshita ('10). 



24. Extirpation of the ganglion produces four chief effects: 

 interruption in the coordination of the siphons, decrease of 

 sensitivity, increase of latent period and a lengthening of the 

 duration of contraction (Kinoshita, '10; Polimanti, '10). 



25. The ganglion regulates reflexes in a feeble way either by 

 inhibiting or facilitating them (Jordan, '08; Polimanti, '10). 



