86 GIBBS, WILLIAMS, AND PRATT. 
foil to protect the solution from the light. All tubes were 
fastened upon the circumference of a revolving wheel, to keep 
the contents in constant agitation, cooled by a spray of water 
and kept in the sunlight for ninety-five hours. The temperature 
never rose above 28°, and when not in the sun, the tubes were 
placed in an ice box. 
TABLE I.—Sealed tubes, containing methyl salicylate and various substances 
with atmospheric air, placed in sunlight and in dark. Sealed on Feb- 
ruary 29, 1908, and examined March 27, 1908. In direct sunlight for 
ninety-five hours. 
cube Contents of tube. Position. Coloration. 
| 
Methyl salicylate 1 ce -___________| Aqueous layer colorless. 
13 I light _| Methyl salicylate 1 ight | 
| ° Sulphuric acid N 10 ea ees n sung: ethyl salicylate layer brig emon 
| 10 yellow. 
---—| — a = =— —- 
2S Sane asi as sass arene mee In dark- -__- Clear and colorless. 
i, Methyl salicylate Lec____________- 2 Aqueous layer colorless. I 
33 c ¢ aN In sunlight _ é 
Hydrochloric acid Ti NW) @e ~~. ee | Ester layer, bright lemon yellow. | 
| | 
42377 iSamejas)last-o- acces seen ee eee In dark -___- Clear and colorless. 
ate ray 7 Pl x a | 
7 | 
Methyl salicylate 1 ee -----_.---_. ; Aqueous layer colorless. | 
53 ans eS NT In sunlight _ - 
| Citrie acid 10 OCC ee ee ee Ester layer, bright lemon yellow. 
63 | SamejasJast-______2__-__-=___--_-] Indark_-__/ Clear and colorless. } 
Methyl salicylate 1 cc ____________ 1 5 | 
13 ; N Insunlight _ Aqueous layer brown. | 
Sodium carbonate = 10 ce --.----- Ester layer colorless. 
1 light b . Ester 
gsi Vtenereina (Nabe: steal A Ow Puebla ye a Aqueous layer very light brown 
layer colorless. 
later Yellow. Not so bright as the tubes 
| 93 Methyl salicylate 0.5 ee __________ In sunlight _ ee aie iS 
containing acids. 
A second series of tubes, made three years later, was designed 
to demonstrate the effect of oxygen. The results are shown in 
Table II. 
