Acta Scientiarum Universitatis Pekiniensis

ie sm eee > anreae a ears

i a 7 f 4 iy. LE eae in i, 2 =! _" a e oe sn “= ar i a." tore we ae eee eee. ee ; us wy. Tests! Wc =i Heat == at ‘tae : en AE a a == Sse a . Hf i, sO 7 a = . - i a L = =.= sted ye ia RE fr a 7 4 eel Sie