University of Edinburgh f> CiIk:.' 2 -! ': i, i; L 1. Ldc A' L 2-1 T , DEPARTMENT OF ZOOLOGY, THE ASHWORTH LABORATORY WEST MAINS ROAD, EDINBURGH 9 Prqfessors : Michael Swam FR S, P R s E : J.M.Mitchison Telephone N EWington 1081 Dear IJrofes3or :-picge linaii, ~ ..................=............ .... ...... .. ....__...--......._ ....................... _.._ ....... ' ........ "." .._.." ....._ j" .-.... "_ ,I > c C C C - U C k 2 U c: ; 4 U C n -.-----.-....----.-...... "....I ......... I-- .... _I.......Y..." .._..-. ~ _..._.I.. ~ .... * ........ I.." ._..--. __ ""."_"-.l._."".^......ll.l-ll--l.lllll"~..~~ ........................... "..-_."" ........_ : ............ . W'JQ PI05 lsJ!dW