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Manufacture of new azo-dyestuffs. Printed Copies of the full Published Specification may be obtained from the Patent Office, 25,Southampton Buildings, London, W.C.2., at the uniform price of ls. each. Abstract Published. 252,099.-Synthetic drugs.-Stickings, R. W. E., The Rowans, Ravensbury Park, Mitcham, Surrey; and May & Baker, Ltd., Garden Wharf, Church Road, Battersea, London. Piperazine salts of substituted phenylarsinic acids are prepared by interaction of the acids with piperazine. The combination is preferably effected in the presence of a solvent such as water or alcohol, from which, if desired, the salt is isolated by crystallisation or precipitation. The salts, which are water-soluble, possess therapeutic properties. Examples are given of the preparation of the piperazine salts of p-oxy-m-aminophenylarsinic acid, p-aminophenylarsinic acid, p-oxy-m-acetylaminophenylarsinic acid and N-phenylglycineamide-p-arsinic acid.

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BRITISH PATENT 131,388.

A Preparation of Combustible Salt Suitable for the Manufacture of Explosives and Process for making these Explosives.

The Owner of this Patent wishes to grant Licence or to come into relation with someone competent for the Industrial Working of said Patent.

For particulars, write to

MR. A. VAN DAMME,

7 Rue du Montenegro, Brussels (Belgium).

In other words, the laws of heat of formation and relative volume are two regularities. If these regularities are only imaginary, and not real, i.e., if they are merely the result of juggling with figures, it would be impossible to discover any other regularity within them. A regularity can only be discovered within a regularity if the latter is real and not imaginary.

The numbers in the last columns of the Tables refer to substances in this and the two preceding papers.

Table XVI. gives the cases in which two volumes of the same element differ by 5.02. columns of the Periodic Table. column containing the gases of zero-valency

(The

2.51

This is supposing there are only seven. columns. If there are nine, not including the zero-column, the probability against its happening by accident would be more than 70,000: 1.

This is another regularity appearing within a regularity, and is therefore another proof that the law is correct.

The reason why these elements must come in the higher columns is evident from preceding papers, but cannot be discussed now.

The first four in the Table are the only ones whose structures have so far been demonstrated in the Chemical News, and in each case 5.02 has been shown to be the volume of a tetradic portion of the element, viz.: + H

H1 + H +

H3

so it is possible that scientists may trust the statement that when an opportunity occurs

Refer to Difference. Nos. 5.02

80, 93, 74. 148, 150,

etc.