1885.] A. Pedler — Gorrosinn of Lead Linirii/fi of Indian Tea Ohests. 167 



No. 2. One side of the lead quite bright and free from corrosion, and 

 the other side covered with a fungus growth, which on removal showed 

 the lead surface bright and uncorroded. 



No. 3. The upper plank marked C was discoloured. (This was the 

 plank which had been saturated with fresh water.) The lead surface 

 next to this plank was partly covered with vegetable growth, and there 

 was also a moderate amount of corrosion, " white lead " being present in 

 considerable quantity. 



The lower plank (seasoned wood not moistened with water) was 

 clean, and the surface of the lead in contact with it was quite clean and 

 free from all trace of corrosion. 



No. 4. Both surfaces of lead were covered with vegetable or fungoid 

 growth. The amount of corrosion seen on removing the vegetable 

 growth did nofc appear to be large, but considerable quautities of white 

 lead were found with the fungoid growth. 



No. 5. The greater part of the lead was corroded and eaten entirely 

 through, and almost the whole of the lead was converted into white lead 

 or carbonate of lead. 



No. 6. Both sides of lead were covered with vegetable growth. In 

 certain parts of the lead there had been considerable corrosion, and a 

 moderate amount of w^hite lead was present. 



No. 7. On both sides of the lead there was a large amount of fungoid 

 growth and also of corrosion of the lead, much carbonate of lead was 

 present, and in two places the lead was entirely eaten through. 



No. 8. Parts of the wood had almost entirely decayed away or rotted, 

 and the wood was an extremely soft one. Under the surface of the wood 

 which had decayed, the lead was covered with vegetable growth and much 

 corroded, but on the other surface of the lead, next to the wood which 

 had not decayed, the greater part was quite clean and bright, and only 

 a small amount of corrosion was detected. 



No. 9. Both sides of the lead were much corroded. 



No. 10. On the upper surface of the lead there was a moderate 

 amount of vegetable growth, and a small amount of corrosion, and on the 

 lower side of the lead there was a large amount of vegetable growth and 

 a moderate amount of corrosion. 



The results of the first three experiments in the above sets of wood 

 strikingly confirm the results of the previous experiments with the tea 

 chests, and it will be seen that unseasoned mango wood attacks lead 

 in a moist atmosphere rather violently, also that seasoned mango wood 

 kept dry has no action on it, but that seasoned mango wood, if it 

 is subsequently saturated with water, becomes again in a condition 

 in which it is able to attack lead in the presence of a moist atmosphere, 

 22 



