Fitch & Anders: "Organized Elements" in Chondrites 501 



Gelatin was used to adhere the samples to the slides because preliminary experi- 

 ments showed that there was little staining of the gelatin. 



The Feulgen reaction was carried out in the routine manner on these samples 

 with the usual hydrolysis with 1 n HCl at 60° C. for 8 minutes followed by 



Figure 3. Orgueil, rat spleen, and kimberlite stained with the Feulgen reaction. (.4) 

 Orgueil, Feulgen reaction. Most particles stain irregularly. (B) Rat spleen, Feulgen reac- 

 tion. Nuclei have brilliant magenta staining of DNA. Other tissue comi)onents do not 

 stain. (C) Kimberlite, Feulgen reaction. Most particles stain irregularly. Some of the 

 sample was dissolved by the HCl treatment. (Z?) Orgueil, Schiff's reagent only. Staining is 

 as intense as with the Feulgen reaction. (E) Rat spleen, Schiff's reagent only. There is no 

 staining of nuclear DNA. (F) Kimberlite, Schiff's reagent only. Staining is as intense as 

 with the Feulgen reaction. 



treatment with Schiff's reagent for 1 hour.^ As a control procedure, samples 

 were reacted with Schiff's reagent for 1 hour without previous treatment with 

 acid. In the rat spleen sections, nuclear DNA stained brilliantly after acid 

 hydrolysis (figure S, B). In sections treated with Schiff's reagent alone, no 

 staining occurred (figure 3, E). However, samples of Orgueil and kimberlite 

 stained equally well whether treated with acid or not (figure 3; A, D, C, F). 

 Something is present in the meteorite and in kimberlite which reacts directly 



