Chapter V (3)

1st. ONE MATERIAL AND ONE APPLICATION.--Creosote, Petroleum. _Order_--Ancient Egyptians, or Bethell’s, Burmese.

2nd. TWO MATERIALS AND ONE APPLICATION.--Chloride of zinc and water; sulphate of copper and water; corrosive sublimate and water. _Order_--Burnett, Boucherie, Kyan.

3rd. TWO MATERIALS AND TWO APPLICATIONS.--Sulphate of iron and water; afterwards sulphate of lime and water. Payne.

We thus observe there are _twice three_ successful patent processes.

Any inventions which cannot be brought under these three classes have had a short life; at least, we think so.

The same remarks will apply to _external_ applications for wood--for instance, coal-tar, _one application_, is more used for fencing than any other material.

We are much in want of a valuable series of experiments on the application of various chemicals on wood to resist _burning to pieces_; without causing it to _rot speedily_.