Mr. Gallagher.

It iS my understanding that Dr. Morton Mason, Director of Dallas City-County Criminal Investigation Laboratory made and processed the paraffin casts.

Mr. Redlich.

Now, would you proceed ?

Mr. Gallagher.

The paraffin casts were analyzed by neutron activation analyses to determine if these casts from Oswald, which were made, chemically treated, and subsequently washed by investigators in the Dallas area, bear any deposits which could be associated with the rifle cartridges found in the Texas School Book Depository Building.

Mr. Redlich.

Do you know why the casts had been chemically treated in Dallas?

Mr. GALLAGHER. Reportedly, these casts were chemically treated for the presence of nitrates.
Mr. REDLICH. This iS what is popularly referred to as the paraffin test?

Mr. Gallagher.

Yes; it has been popularly referred to as the paraffin test.

Mr. Redlich.

And your testimony is that these casts had been washed by the time they reached your possession; is that correct?

Mr. Gallagher.

Yes, sir.

Mr. Redlich.

Would you continue ?

Mr. GALLAGHER. The deposits found on the paraffin casts from the hands and cheek of Oswald could not be specifically associated with the rifle cartridges. The casts from Oswald bore elements--namely, barium and antimony--which were present in the powder residues from both the rifle, and revolver cartridges. No characteristic elements were found by neutron activation analysis of the residues which could be used to distinguish the rifle from the revolver cartridges. In view of the fact that the paraffin casts were not made until after the reported firing and handling of the fired revolver, no significance could be attached to the residues found on the casts other than the conclusion that the barium and antimony in these residues are present in amounts greater than found on the hands of an individual who has not recently fired or handled a recently fired weapon.

Mr. Redlich.

You mentioned in your answer, Mr. Gallagher, that the elements which you found present on the paraffin casts, which were also present on the spent cartridges found at the Texas School Book Depository, were the elements barium and antimony; is that correct ?

Mr. Gallagher.

Yes, sir.

Mr. Redlich.

In your opinion, what is the source of the elements barium and antimony on these cartridges ?

Mr. Gallagher.

Barium and antimony are residues left from the spent primers in the cartridges.

Mr. Redlich.

The primer being the portion of the cartridge which ignites the principal explosive substance in the cartridge; is that correct?

Mr. Gallagher.

The primer is that portion of the cartridge which is----

Mr. Redlich.

If I may interrupt--which is initially struck by the firing pin?

Mr. Gallagher.

Which is struck by the firing pin, and detonates to initiate the explosive charge in the cartridge itself.

Mr. Redlich.

Now, are the elements barium and antimony found in most primer residues ?

Mr. Gallagher.

Barium and antimony are found in most primer residues; yes.

Mr. Redlich.

Did you determine whether barium and antimony are present in the Western Cartridge Co. ammunition which was found on the sixth floor of the Texas School Book Depository?

Mr. Gallagher.

I did, sir.

Mr. Redlich.

And did you find that barium and antimony are, in fact, found in ammunition of that manufacturer?

Mr. Gallagher.

Yes.

Mr. Redlich.

Did you also determine whether the elements barium and antimony are found in the .38 caliber ammunition manufactured by Remington Peters and Winchester Western, which was the ammunition used in the shooting of officer Tippit?

Mr. Gallagher.

Yes; I did.

Mr. Redlich.

And did you find that the elements barium and antimony were, in fact, present in this type of ammunition?