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Show 10 I ITR DUCTION. f th th r x, th diffi r n b tween the two kin ls i u. uall y u t gr at. \Vh n th differ _nee is r at, a in tkin- aring 1lants, this d p nl 1· ro- 1y on nutny f the I i s in thi , as '"' 11 a in h r li iou cla , b in o- £ rtilis d. by the < icl wind;* £ r the male flowers have in this to pr du a urpri ing am unt of in h r nt p 11 n. 1 0in £ w monoociou plants consi t f two Lo li f individual , with th ir fl wers diffi rino- in b fun·ti n, th uo-h n t in stru ture; for certain inclivi-chu l. 1natur th ir p ll n b :f r the £ male flowers on th tun plantar r acly £ r £ rtilisation, an l ar all u pr t randrou ; whil t c nv rsely oth r individual , 11 d I r t r o-ynous, have th ir stigmas mature b fore th ir I ll ·n i r ad y. The purposet f his curious functi nal iffi r n bvi usly i to favour the cross-£ rtiliati n f di. tin t 1lant . A case of this kind wa first b IT l by D l1 ino in the Walnut (Juglansregia), and ha in b n b rved with the common Nut (Corylus avellana ). I I ay add that according to H. Miill r the in<livi ual of me £ w hermaphrodite plants di:ffi r in lik mann r; me b ing proterandrous and oth rs pr t •r gyn u .t n cultivat d trees of the Walnut and ulb IT th mal fi w rs have b en observed to abort c n rtain individual t, which have thus been conv rted into £ I al ; but wh ther there are any sp ci s in a tt t f IU tur which o- xist as monoocious and £ male indi vidut 1 , I d not know. Th third la s consists of dioocious speci s, and the xi. p. 507, and 1875, p. 26. On proterandrous and prot rogynous h rmaphrodite individuals of the same specie , see H. Mi.ill r, 'Die Befruchtung,' &c., pp. 2 5, 339. t 'Gardener's Cbron.' 1847, pp. 54:1, 558. 1 r th 11 t ·In "ith t< th lUllOllllt 11 h f 1nnl '1 h ! f< urt h ancl ]a ·t ln "hi] t in flower, aucl t . th' U ' U llOll •, ( thu.t it |