$irkbe& College Crystallograph$ Lab.*

21 Torrington Square,
   London, W.CA

         8inm my return X have calculated P ;IPQu"IBF
pro$sction, and ffnd that T6v apparerntly has a high-density
sheu. with a radius of abouf 55A.
to h33. me that Ire has a sidlar resat, though he finds a
sfighw Seer FadiW)r Bu~ f d thin)r we need necessarily
c#rnazlude that the RBA lies in this

(Caspar has also written

tion; the heavy shell

may siarply be4 a aheU of low hy8xlatioa.

Z hope to have a short pager ready soon on this

If you senti plff SORB B8, would you please let me

Thank you again; for all your help,
    Yours slncemly,

and related subjects.

know what precautions alp8 aeoeers@Fy to prevent it from de-
polyaaerislng?