n 





I'm. 1(1. — Tin: m.i) jietiiod of filling in swa:mi's by hand labolie, gold coast. 



p. 71] 



i'iU. 17. — THIO .MOlJEKN .MKTH^JJ OF FILLlNti IN .SWA.Ml'.S l:Y SAND PUMP, 



LAGOS, SOUTHERN NIGERIA. 



