34 



nest, but eight were lying on their backs near the repellent, apparently 

 overcome by the odor. At 10: 05 (40 minutes), practically all the ants 

 were out on the base, some of those that were overcome struggling 

 about, unable to escape. 11a. m., eleven ants were apparently dead 

 in the nest. At 11 : 55, fourteen dead ants were seen under the cover. 

 By 3:15 several of those overcome had either recovered or had been 

 carried out. At 5:15 (7 hours, 50 minutes), no ants were in the nest. 

 The same entry was made at intervals from May 5 at 9 a. m. to May 8, 

 no ants having entered the nest at any time during this interval of 

 four days from the beginning of the experiment. 



Experiment 5744, Anise Oil. — June 30, 1909, 10: 50 a. m. In tliis 

 experiment a large nest with a cement bottom was used with a cover 

 3^ inches across. Sand moistened with anise oil was placed at the 

 center of the nest. The ants scattered immediately, deserting their 

 larvae, which were in two piles two-eighths and six-eighths of an inch, 

 respectively, from the repellent. At 11 o'clock five ants were under 

 the glass about the pile of larvae which was farthest from the sand, 

 and others were occasionally running about under the cover. At 11: 30 

 the larvae most distant from the sand had been moved out on the base, 

 and no ants were now under the cover. At 5 p. m. (6 hours, 10 

 minutes), all the larvae had been removed from the nest and no ants 

 were under the cover. July 7(1 week) ; up to this time no ants had 

 returned to the nest. This was a weak colony, however, and the test 

 with anise oil should have been made again with a larger number of 

 ants. 



Experiment 5748, Gum Camphor. — January 29, 11 a. m.. gum 

 camphor, cut up into fine particles and moistened with water, was 

 placed at the center of a nest. The ants scattered immediately, many 

 of them running about over the base but most of them hovering over 

 the larvae about three-fourths of an inch within the nest. At 11 :15 a 

 few ants were under the corners of the cover nearest the larvae. At 

 11: 30 most of the ants had gone outside the nest, clustering around 

 the larvae, but a few were under one corner of the cover, and two 

 small companies were farther out on the base. At 1 : 50 p. m. (2 hours. 

 50 minutes), about one-fourth to one-fifth of the ants were under the 

 cover, the nearest seven-eighths of an inch from the repellent. The 

 ants were in two companies, one near the nest and the other at a cor- 

 ner of the base (Fig. 12, A) ; and at 5:30 (6 hours, 30 minutes) the 

 situation was unchanged. On the following day, January 30, at 10: 45 

 a. m. (23 hours, 45 minutes), about half the ants were gathered along 



