If you can screw out time, do look at the stigma of the blue Leschenaultia biloba. I have just examined a large bud with the indusium not yet closed, and it seems to me certain that there is no stigma within. The case would be very important for me, and I do not like to trust solely to myself. I have been impregnating flowers, but it is rather difficult... I have just looked again at Viola canina. The case is odder: only 2 stamens which embrace the stigma have pollen; the 3 other stamens have no anther-cells and no pollen. These 2 fertile anthers are of different shape from the 3 sterile others, and the scale representing the lower lip is larger and differently shaped from the 4 other scales representing 4 other petals. In V. odorata (single flower) all five stamens produce pollen. But I daresay all this is known. LETTER 592. TO J.D. HOOKER. November 3rd [1862]. Do you remember the scarlet Leschenaultia formosa with the sticky margin outside the indusium? Well, this is the stigma--at least, I find the pollen-tubes here penetrate and nowhere else. What a joke it would be if the stigma is always exterior, and this by far the greatest difficulty in my crossing notions should turn out a case eminently requiring insect aid, and consequently almost inevitably ensuring crossing. By the way, have you any other Goodeniaceae which you could lend me, besides Leschenaultia and Scaevola, of which I have seen enough? I had a long letter the other day from Crocker of Chichester; he has the real spirit of an experimentalist, but has not done much this summer. LETTER 593. TO F. MULLER. Down, April 9th and 15th [1866].