314 Mr. "Boulton^B further experiments upon 



Experiment I. 

 Dark Surroundings. 



May 27.— 16 larvae ; the 

 least dark twigs were re- 

 moved and replaced by very 

 black ones. The larvre were 

 all very ilark, 5 being ex- 

 tremely black. They were 

 not quite so large as II. 



Blay 30. — 9 very dark, 

 although 5 were still black- 

 est. The remaining 7 were 

 removed to another cylin- 

 der with similar surround- 

 ings ; 2 of them were nearly 

 mature and dark, although 

 not so deep a tint as the 9. 

 The 5 smaller larviB were 

 dark, but varied in depth. 



June 2. — The 5 smaller 

 larvffi were becoming very 

 dark ; the 2 large ones had 

 also deepened, but not so 

 much as the others : they 

 were now practically mature. 

 No note as to the 9 dark 

 ones, which were probably 

 unchanged. 



JiDie 4. — 2 of the darker 

 lot of 9 and 2 of the less 

 dark lot of 7 were preserved. 

 The former were not the 

 blackest individuals. 



Experiment II. 

 Green Surroundings, 



May27.—LotofQ : Many 

 nearly full-grown ; 6 being 

 large and very light, 1 

 darker. 2 smaller larvre 

 were much the darkest. A 

 remarkable difference be- 

 tween these 9 and the larv.T3 

 of Experiment I. 



First lot of 3 (moderate- 

 sized larv.v when sejjarated 

 May 14). — Larvie becoming 

 very light, perhaps more so 

 than the lot of 9. 



Second lot of 3 (small 

 larvae when separated May 

 14). — Larvfe were still 

 small. 



Lot of 2 (moderate-sized 

 when separated May 14). — 

 Hoth larviB becoming very 

 light, with a greenish tinge. 



May 30. — Lot of 9 : 7 

 nearly mature ; 6 very light ; 

 1 large one and 2 smaller 

 ones were distinctly darker 

 than the G, but not like the 

 larvaj of I. 



June 1.— Lot of 9: 2 light 

 ones spinning ; another 

 matured June 2. 



First lot of 3. — Becoming 

 light ; 2 very light, like the 

 lightest of the lot of 9. 



Second lot of 3. — Becom- 

 ing lighter. 



Lot of 2. — Very light, as 

 light as any in Experiment 

 II. 



June 4.— Lot o/9 : 2 light 

 ones spun up, and 1 drown- 

 ed accidentally ; the large 

 darker one jircserved : it 

 remained much darker than 

 the others to the end. 



First lot of 3. — 1 dead 

 (probably the least light 

 larva) ; 1 spun and 1 pre- 

 served. 



Second lot of 3. — Had be- 

 come still lighter, especially 

 the 2 larger, which were 

 preserved. No further notes 

 of the remaining larva. 



Experiment III. 



Green Surroundings 



in the dark. 



May 27.— 11 larv* ; 

 they were small, darker 

 than II., but 7nuch 

 lighter than I. 



June 1. — The larvte 

 were now becoming 

 darker rather sudden- 

 ly ; they were consider- 

 ably smaller than those 

 of I. and II. 



June 4. — 11 larv.T, a 

 good deal darker than 

 II., but not dark like 

 I., being much nearer 

 to the former ; 4 pre- 

 served, 1 of which was 

 much lighter than 

 others. 



