TENTH WEEK. 



Three species of insects should be determined this week. For di- 

 rections see under sixth week. 



ELECTIVE WORK. Physiology (con.) 



FOURTEENTH WEEK. Observe and note the effect of loading the 

 body with shot and the tip of one and both wings with wax or paraffin. 



FIFTEENTH WEEK. Remove one and both halters and note the 

 result. Darken the ocelli with India ink. and note results. Darken 

 also one and both eyes, and both eyes and ocelli. Note particularly 

 the significance of these results. 



SIXTEENTH WEEK. Slightly chloroform a number of flies and 

 compare their flight with the normal, and also observe the effect of plac- 

 ing flies a short time in a cyanide bottle. Note particularly the signif- 

 icance of these results as compared with the preceding experiments. 



GROUP III. Sensations. Needed: Blue printing and tracing 

 materials as in group one, but larger-sized sheets, at least twelve in- 

 ches square. A set of blocks Ixlx^ inches in size twelve white, 

 twelve black, six red, six blue, six yellow and six green. A box 

 divided into six equal sections by partial partitions, with a set of glass 

 covers for these partitions six clear, six black, one red, one yellow, one 

 blue and one green. A musical instrument. A set of vials containing 

 different odors. A quantity of insects of various kinds. 



TWELFTH WEEK. Blacken a sheet of glass and arrange the 

 black and white blocks on it to form a labyrinth, so that an insect 

 set in the middle cannot see out. Set in w a light where the 

 blocks will cast distinct shadows and liberate an insect in the center. 

 The tracing it makes indicates to some extent its sight perception. 

 After the tracing is made mark the outline of the shadows with a pin 

 and also the outlines of the blocks, writing as well the color of each. 

 Now take a blue print of the tracings and note the significance of the 

 various parts. 



THIRTEENTH WEEK. Repeat the above, but with the labyrinth 

 composed of blocks of all colors to determine the relative color percep- 

 tion. 



FOURTEENTH WEEK. Arrange the colored plates over the sec- 

 tions of the box and liberate a number of insects, first in one and then 

 in another, and after a short time note in what compartments they are to 

 be found, and thus determine for each insect its color preference. 



FIFTEENTH WEEK. Place an insect where it can be carefully 

 watched, and then sound different tones on the musical instrument and 

 note any evidence of sound perception. Determine for those evincing 

 this perception the pitch producing the most effect and see if the in- 

 strument produces notes in either direction beyond their power of per- 

 ception. 



SIXTEENTH WEEK. Cover the sections of the box with all black 

 or all clear glass, according to the nature of the insects experimented 

 with, and place in each an open vial containing an odor. Now by 

 liberating a number of insects, first in one and then in another, their 

 odor preference may be determined. 



