168 A. Pedler — Corrosion of Lead Linings of Indian Tea Chests. [No. 3, 



though not so violently as is the case with the unseasoned wood. Of the 

 other seven varieties of wood, all of them in a damp and unseasoned 

 condition, every sample corroded the lead in a moist atmosphere, some 

 woods corroding the lead very largely and others to a smaller extent. 



In order to test further the action of these woods on tea-lead each of 

 them was distilled in a current of steam to get off any volatile substance 

 present or produced by the action of water. The distillates were then 

 taken, a portion of each placed in large bottles with tea lead hanging over 

 the liquid, and the bottles filled repeatedly with moist air containing car- 

 bonic acid. 



No. 1 distillate had a very musty and unpleasant odour, and had 

 only an excessively faint acid re-action. It was treated as above when 

 the lead was somewhat corroded at the bottom of the slip, and lead car- 

 bonate was found to be present in small quantity. 



No. 2 distillate also had a very musty unpleasant odour, and the 

 watery layer was very faintly acid. The lead surface was slightly dulled, 

 but no actual corrosion was perceptible. 



No. 3 distillate had also a musty unpleasant odour, the liquid was 

 almost neutral in re-action. The surface of the lead was very distinctly 

 corroded, and a small amount of lead carbonate was found. 



No. 4 distillate had a musty unpleasant odour, and the liquid was 

 faintly acid. The surface of the lead was slightly dull, and very faint 

 traces of corrosion were found. 



No. 5 distillate had a musty unpleasant odour, and the watery solu- 

 tion was faintly acid. The surface of the lead was slightly dull, and there 

 was slight corrosion at a few points. Lead carbonate was present. 



No. 6 distillate had a musty unpleasant odour, and the solution was 

 faintly acid. The surface of the lead was decidedly dull and whitish, 

 though there was only slight corrosion. 



No. 7 distillate had a musty and unpleasant odour, and the liquid 

 was certainly not acid, but distinctly alkaline. The surface of the 

 lead was practically unacted upon. 



No. 8 distillate had a slight ethereal smell but also a musty un- 

 pleasant odour ; the liquid was alkaline. The lead surface was almost 

 bright and there was practically no corrosion. 



No. 9 distillate had a musty unpleasant odour, and the liquid was 

 distinctly alkaline. The lead surface was almost bright, and there was 

 practically no corrosion. 



No. 10 distillate had a musty unpleasant odour and the liquid was 

 almost neutral. The surface of the lead was distinctly tarnished, and a 

 small amount of corrosion was visible ; small amounts of lead carbonate 

 were present. 



