G. 6. SO,

I 366

J O H N WIKIlv ttchiiig at Soo, the sniiipie was open to suspicion as contnitiing added fluoride. 111 coi;ciusioii, the authors take pleasure iii ackiio\\.ledgiiig their indei)!c-dnc..;; t o Miss 1:lizahetli ilniisoti for i!ittcli paiiist:tking aiid careful anai !:t i c ;;i x(I ? 1:. . ~ I . ~ s s . ~ c I ~ Li -r,s s I :INSTITL'TI:O F

Julie.

I